Annual report pursuant to Section 13 and 15(d)

VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Aeroleo Narrative (Details)

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VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Aeroleo Narrative (Details)
1 Months Ended 12 Months Ended
Oct. 01, 2015
Jul. 01, 2011
USD ($)
Aug. 31, 2011
helicopter
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
helicopter
Dec. 31, 2013
USD ($)
helicopter
Sep. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Schedule of Equity Method Investments [Line Items]                
Investments in and advances to equity investees       $ 36,000 $ 125,000 $ 0    
Recognized impairment charge       0 0 0    
Deferred Revenue       0 $ 31,047,000 $ 24,243,000   $ 8,953,000
Aeroleo                
Schedule of Equity Method Investments [Line Items]                
Ownership   50.00%            
Voting ownership percentage   20.00%            
Investments in and advances to equity investees   $ 4,800,000            
Number of helicopters leased | helicopter         11 11    
Aeroleo | Equity Method Investee                
Schedule of Equity Method Investments [Line Items]                
Notes receivable to related party   $ 6,000,000            
Notes receivable interest rate   6.00%            
Revenue from related parties       $ 21,400,000 $ 16,700,000 $ 16,200,000    
Aeroleo | Co-venturer                
Schedule of Equity Method Investments [Line Items]                
Holding period for put/call arrangement (in years) 2 years              
Equipment Leased to Other Party | Aeroleo                
Schedule of Equity Method Investments [Line Items]                
Number of helicopters | helicopter     4          
Variable Interest Entity, Not Primary Beneficiary | Aeroleo                
Schedule of Equity Method Investments [Line Items]                
Percent of economic interest 50.00%              
Percent of voting interest 80.00%              
Aeroleo | Aeroleo | Equity Method Investee                
Schedule of Equity Method Investments [Line Items]                
Deferred Revenue         $ 31,000,000   $ 42,100,000