Annual report pursuant to Section 13 and 15(d)

ESCROW DEPOSITS Escrow Deposits (Details)

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ESCROW DEPOSITS Escrow Deposits (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
helicopter
Dec. 31, 2015
USD ($)
helicopter
Dec. 31, 2014
USD ($)
helicopter
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Deposits in like-kind exchange escrow accounts $ 3,800,000 $ 0  
Proceeds from disposition of property and equipment 28,609,000 25,328,000 $ 7,051,000
Purchases of property and equipment 39,200,000 60,050,000 106,732,000
Escrow deposits 3,777,000 191,000  
Medium helicopters      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from disposition of property and equipment     $ 3,000,000
Number of disposals | helicopter     2
Escrow deposits     $ 6,400,000
AW139 Helicopter      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from disposition of property and equipment $ 18,200,000.0    
Number of disposals | helicopter 2    
AW189 Heavy Helicopters      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Purchases of property and equipment $ 7,400,000    
S92 Heavy Helicopters      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Purchases of property and equipment $ 7,000,000    
Light Twin Helicopter      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from disposition of property and equipment   $ 2,800,000  
Number of disposals | helicopter   1  
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