Annual report pursuant to Section 13 and 15(d)

VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Era Training Center Narrative (Details)

v3.10.0.1
VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Era Training Center Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
simulator
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of flight simulators sold | simulator 3    
Proceeds from sale $ 2.9    
Payments for Purchase of Other Assets 0.4    
Equity Method Investee | Training Services      
Schedule of Equity Method Investments [Line Items]      
Notes receivable to related party 3.6 $ 3.7  
Era Training Center      
Schedule of Equity Method Investments [Line Items]      
Notes receivable to related party 0.4    
Era Training Center | Equity Method Investee | Helicopter, Management and Other Services      
Schedule of Equity Method Investments [Line Items]      
Expenses from transactions with related party 0.1 0.2 $ 0.2
Era Training Center | Equity Method Investee | Training Services      
Schedule of Equity Method Investments [Line Items]      
Expenses from transactions with related party $ 0.2 $ 0.5 $ 0.6