Annual report pursuant to Section 13 and 15(d)

INVESTMENTS, AT EQUITY, ADVANCES TO 50% OR LESS OWNED COMPANIES Schedule of Equity Method Investment, Financial Information, Balance Sheets (Details)

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INVESTMENTS, AT EQUITY, ADVANCES TO 50% OR LESS OWNED COMPANIES Schedule of Equity Method Investment, Financial Information, Balance Sheets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dart Helicopter Services LLC [Member]
    
Schedule of Equity Method Investments [Line Items]    
Current Assets $ 19,231 $ 18,845
Noncurrent Assets 37,636 42,423
Current Liabilities 8,613 8,754
Noncurrent Liabilities 6,963 12,590
Other Investments [Member]
    
Schedule of Equity Method Investments [Line Items]    
Current Assets 4,378 2,278
Noncurrent Assets 20,018 22,611
Current Liabilities 2,789 2,523
Noncurrent Liabilities $ 7,918 $ 9,146