Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS AND DISPOSITIONS Capital Expenditures (Details)

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ACQUISITIONS AND DISPOSITIONS Capital Expenditures (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
helicopter
Dec. 31, 2017
USD ($)
helicopter
Dec. 31, 2016
USD ($)
helicopter
Property, Plant and Equipment [Line Items]      
Capital expenditures $ 9,216 $ 16,770 $ 39,200
Proceeds from disposition of property and equipment 29,590 $ 9,392 $ 28,609
Sales-type lease, proceeds from dispositions $ 1,200    
Number of helicopter additions | helicopter 1 1 2
H225 Heavy Helicopters      
Property, Plant and Equipment [Line Items]      
Sales-type lease, number of helicopter dispositions | helicopter 6    
Sales-type lease, loss on disposition $ 4,000    
Heavy helicopters      
Property, Plant and Equipment [Line Items]      
Number of helicopter additions | helicopter 1 1 2