Quarterly report pursuant to Section 13 or 15(d)

ESCROW DEPOSITS (Details)

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ESCROW DEPOSITS (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2013
helicopter
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Escrow Deposits [Abstract]          
Number of helicopters disposed 2        
Proceeds from disposition of property and equipment $ 18,000 $ 18,100 $ 38,492 $ 4,526  
Escrow deposits   $ 16,010 $ 16,010   $ 0