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, 2017
USD ($)
helicopter
Dec. 31, 2016
USD ($)
helicopter
Dec. 31, 2015
USD ($)
helicopter
Property, Plant and Equipment [Line Items]      
Capital expenditures | $ $ 16,770 $ 39,200 $ 60,050
Proceeds from disposition of property and equipment | $ $ 9,392 $ 28,609 $ 25,328
Equipment Additions (in helicopters) 1 2 8
Equipment Dispositions (in helicopters) 3 9 20
Light helicopters - single engine      
Property, Plant and Equipment [Line Items]      
Equipment Additions (in helicopters) 0 0 1
Equipment Dispositions (in helicopters) 1 2 10
Number of helicopters disposed in sales type lease (in helicopters)   2  
Light helicopters - twin engine      
Property, Plant and Equipment [Line Items]      
Equipment Additions (in helicopters) 0 0 3
Equipment Dispositions (in helicopters) 1 1 3
Medium helicopters      
Property, Plant and Equipment [Line Items]      
Equipment Additions (in helicopters) 0 0 0
Equipment Dispositions (in helicopters) 1 6 7
Heavy helicopters      
Property, Plant and Equipment [Line Items]      
Equipment Additions (in helicopters) 1 2 4
Equipment Dispositions (in helicopters) 0 0 0
Hauser | Light helicopters - single engine      
Property, Plant and Equipment [Line Items]      
Equipment Additions (in helicopters)   1  
Hauser | Light helicopters - twin engine      
Property, Plant and Equipment [Line Items]      
Equipment Additions (in helicopters)   3