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Long-Term Debt (Narrative) (Details) (USD $)
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6 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Jun. 30, 2014
Revolving Credit Facility [Member]
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Mar. 31, 2014
Revolving Credit Facility [Member]
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Mar. 30, 2014
Revolving Credit Facility [Member]
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Mar. 31, 2014
Letter of Credit [Member]
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Dec. 07, 2012
7.750%Senior Notes [Member]
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Jun. 30, 2014
7.750%Senior Notes [Member]
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Mar. 31, 2014
7.750%Senior Notes [Member]
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Dec. 31, 2013
7.750%Senior Notes [Member]
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Dec. 07, 2012
7.750%Senior Notes [Member]
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Jun. 30, 2014
Revolving Credit Facility [Member]
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Dec. 31, 2013
Revolving Credit Facility [Member]
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Jun. 30, 2014
Secured Debt [Member]
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Dec. 31, 2013
Secured Debt [Member]
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Jun. 30, 2014
Base Rate [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2014
London Interbank Offered Rate (LIBOR) [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2014
Maximum [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2014
Maximum [Member]
Base Rate [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2014
Maximum [Member]
London Interbank Offered Rate (LIBOR) [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2014
Minimum [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2014
Minimum [Member]
Base Rate [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2014
Minimum [Member]
London Interbank Offered Rate (LIBOR) [Member]
Revolving Credit Facility [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||
| Debt Instrument, Basis Spread on Variable Rate | 0.75% | 1.75% | 2.00% | 3.00% | 0.75% | 1.75% | ||||||||||||||||||
| Face amount | $ 200,000,000.0 | |||||||||||||||||||||||
| Stated interest rate | 7.75% | 7.75% | ||||||||||||||||||||||
| Line of Credit Facility, Maximum Borrowing Capacity | 300,000,000.0 | 200,000,000.00 | 50,000,000.0 | |||||||||||||||||||||
| Line of Credit Facility, Borrowing Capacity Increase Limit | 100,000,000.0 | |||||||||||||||||||||||
| Proceeds from issuance of long-term debt | 0 | 15,000,000 | 191,900,000 | |||||||||||||||||||||
| Long-Term Debt | 283,819,000 | 285,311,000 | 200,000,000 | 200,000,000 | 55,000,000 | 55,000,000 | 28,819,000 | 30,311,000 | ||||||||||||||||
| Remaining borrowing capacity | 244,300,000 | |||||||||||||||||||||||
| Letters of credit outstanding | 700,000 | |||||||||||||||||||||||
| Debt Issuance Cost | 2,400,000 | |||||||||||||||||||||||
| Payments on other long-term debt | $ 1,500,000 | |||||||||||||||||||||||
| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.375% | 0.50% | 0.375% | |||||||||||||||||||||