Annual report pursuant to Section 13 and 15(d)

ESCROW DEPOSITS Escrow Deposits (Details)

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ESCROW DEPOSITS Escrow Deposits (Details)
 1 Months Ended 12 Months Ended
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
helicopter
Dec. 31, 2014
USD ($)
helicopter
Dec. 31, 2013
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Deposits in like-kind exchange escrow accounts   $ 0 $ 0  
Proceeds from disposition of property and equipment   $ 25,328,000 $ 7,051,000 $ 65,151,000
Light Twin Helicopter        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of disposals | helicopter   1    
Proceeds from disposition of property and equipment   $ 2,800,000    
Medium helicopters        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of disposals | helicopter     2  
Escrow deposits     $ 6,400,000  
Proceeds from disposition of property and equipment $ 3,000,000      
Hauser | AW139 Helicopter        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of disposals | helicopter   1    
Payment for delayed tax exempt exchange   $ 11,800,000