Quarterly report pursuant to Section 13 or 15(d)

ESCROW DEPOSITS Narrative (Details)

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ESCROW DEPOSITS Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
helicopter
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Significant Acquisitions and Disposals [Line Items]          
Deposits in like-kind exchange escrow accounts $ 2,000   $ 2,000   $ 0
Proceeds from disposition of property and equipment     $ 20,631 $ 7,020  
Light Twin Helicopter          
Significant Acquisitions and Disposals [Line Items]          
Number of disposals | helicopter     1    
Proceeds from disposition of property and equipment     $ 2,800    
AW139 Helicopter          
Significant Acquisitions and Disposals [Line Items]          
Withdrawal from escrow account $ 1,400 $ 8,400      
AW139 Helicopter | Hauser          
Significant Acquisitions and Disposals [Line Items]          
Number of disposals | helicopter     1    
Escrow deposit by Hauser     $ 11,800