Annual report pursuant to Section 13 and 15(d)

VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Schedule of Equity Method Investments (Details)

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VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Schedule of Equity Method Investments (Details) - USD ($)
$ in Thousands
Oct. 01, 2015
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jul. 01, 2011
Schedule of Equity Method Investments [Line Items]          
Equity Method Investments   $ 29,266 $ 28,898    
Dart Helicopter Services LLC          
Schedule of Equity Method Investments [Line Items]          
Ownership   50.00%      
Equity Method Investments   $ 24,782 23,892    
Era Training Center          
Schedule of Equity Method Investments [Line Items]          
Ownership   50.00%      
Equity Method Investments   $ 4,484 4,996    
Heli-Union Era Australia          
Schedule of Equity Method Investments [Line Items]          
Ownership   47.00%      
Equity Method Investments   $ 0 $ 10    
Aeroleo          
Schedule of Equity Method Investments [Line Items]          
Ownership         50.00%
Era do Brazil          
Schedule of Equity Method Investments [Line Items]          
Ownership       50.00% 50.00%
Aeroleo | Variable Interest Entity, Primary Beneficiary          
Schedule of Equity Method Investments [Line Items]          
Remaining ownership percentage acquired 50.00%        
Era do Brazil          
Schedule of Equity Method Investments [Line Items]          
Remaining ownership percentage acquired 50.00%        
Era do Brazil | Variable Interest Entity, Primary Beneficiary          
Schedule of Equity Method Investments [Line Items]          
Remaining ownership percentage acquired 50.00%