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LONG-TERM DEBT - Narrative (Details) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | 0 Months Ended | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 07, 2012
Senior Notes [Member]
7.750% Senior Notes [Member]
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Dec. 31, 2013
Senior Notes [Member]
7.750% Senior Notes [Member]
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Dec. 31, 2012
Senior Notes [Member]
7.750% Senior Notes [Member]
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Dec. 31, 2013
Secured Debt [Member]
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Dec. 31, 2012
Secured Debt [Member]
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Dec. 31, 2013
Secured Debt [Member]
Promissory Note to Purchase Medium Helicopter [Member]
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Nov. 24, 2010
Secured Debt [Member]
Promissory Note to Purchase Medium Helicopter [Member]
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Dec. 31, 2013
Secured Debt [Member]
Promissory Note to Purchase Heavy Helicopter [Member]
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Dec. 23, 2010
Secured Debt [Member]
Promissory Note to Purchase Heavy Helicopter [Member]
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Dec. 31, 2012
Prior to December 15, 2015 [Member]
Senior Notes [Member]
7.750% Senior Notes [Member]
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Dec. 31, 2012
Revolving Credit Facility [Member]
Secured Debt [Member]
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Dec. 31, 2013
Revolving Credit Facility [Member]
Secured Debt [Member]
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Dec. 07, 2012
Revolving Credit Facility [Member]
Secured Debt [Member]
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Dec. 22, 2011
Revolving Credit Facility [Member]
Secured Debt [Member]
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Dec. 31, 2013
Letter of Credit [Member]
Secured Debt [Member]
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Dec. 23, 2011
Letter of Credit [Member]
Secured Debt [Member]
Credit Agreement [Member]
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Dec. 22, 2011
Letter of Credit [Member]
Secured Debt [Member]
Credit Agreement [Member]
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Dec. 22, 2011
Federal Funds Rate [Member]
Letter of Credit [Member]
Secured Debt [Member]
Credit Agreement [Member]
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Dec. 31, 2013
Base Rate [Member]
Letter of Credit [Member]
Secured Debt [Member]
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Nov. 24, 2010
London Interbank Offered Rate (LIBOR) [Member]
Secured Debt [Member]
Promissory Note to Purchase Medium Helicopter [Member]
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Dec. 23, 2010
London Interbank Offered Rate (LIBOR) [Member]
Secured Debt [Member]
Promissory Note to Purchase Heavy Helicopter [Member]
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Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Letter of Credit [Member]
Secured Debt [Member]
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Dec. 23, 2011
Minimum [Member]
Letter of Credit [Member]
Secured Debt [Member]
Credit Agreement [Member]
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Dec. 22, 2011
Minimum [Member]
Base Rate [Member]
Letter of Credit [Member]
Secured Debt [Member]
Credit Agreement [Member]
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Dec. 22, 2011
Minimum [Member]
London Interbank Offered Rate (LIBOR) [Member]
Letter of Credit [Member]
Secured Debt [Member]
Credit Agreement [Member]
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Dec. 23, 2011
Maximum [Member]
Letter of Credit [Member]
Secured Debt [Member]
Credit Agreement [Member]
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Dec. 22, 2011
Maximum [Member]
Base Rate [Member]
Letter of Credit [Member]
Secured Debt [Member]
Credit Agreement [Member]
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Dec. 22, 2011
Maximum [Member]
London Interbank Offered Rate (LIBOR) [Member]
Letter of Credit [Member]
Secured Debt [Member]
Credit Agreement [Member]
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| Debt Instrument [Line Items] | |||||||||||||||||||||||||||||||
| Long-term Debt | $ 285,311,000 | $ 283,098,000 | $ 200,000,000 | $ 200,000,000 | $ 200,000,000 | $ 30,311,000 | $ 33,098,000 | $ 50,000,000 | $ 55,000,000 | ||||||||||||||||||||||
| Stated interest rate | 7.75% | 7.75% | 7.75% | ||||||||||||||||||||||||||||
| Proceeds from issuance of long-term debt | 55,000,000 | 284,622,000 | 252,000,000 | 191,900,000 | |||||||||||||||||||||||||||
| Debt instrument, redemption price, percentage of principal amount redeemed | 35.00% | ||||||||||||||||||||||||||||||
| Debt Instrument, Redemption Price, Percentage | 107.75% | ||||||||||||||||||||||||||||||
| Repayments of borrowings outstanding | 190,000,000 | ||||||||||||||||||||||||||||||
| Line of credit facility, maximum borrowing capacity | 200,000,000.0 | 350,000,000.0 | 350,000,000.0 | 50,000,000 | |||||||||||||||||||||||||||
| Basis spread on variable rate | 0.50% | 1.00% | 2.60% | 2.60% | 2.10% | 1.00% | 210.00% | 200.00% | 3.35% | ||||||||||||||||||||||
| Commitment fee percentage | 0.25% | 0.25% | 0.70% | ||||||||||||||||||||||||||||
| Covenant term, maximum dividend as a percentage of income | 20.00% | ||||||||||||||||||||||||||||||
| Line of credit outstanding | 55,000,000 | ||||||||||||||||||||||||||||||
| Line of credit, Interest rate at year-end | 2.35% | ||||||||||||||||||||||||||||||
| Remaining borrowing capacity | 136,100,000 | ||||||||||||||||||||||||||||||
| Letters of credit outstanding | 8,900,000 | ||||||||||||||||||||||||||||||
| Face amount | 200,000,000.0 | 11,700,000 | 27,000,000 | ||||||||||||||||||||||||||||
| Debt instrument, interest rate at year-end | 2.84% | 2.85% | |||||||||||||||||||||||||||||
| Note required monthly payments | 100,000 | 100,000 | |||||||||||||||||||||||||||||
| Note required final payment | $ 5,900,000 | $ 19,000,000 | |||||||||||||||||||||||||||||