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Impairment Charges and Other Impairment Charges and Other (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2013
Asset Impairment Charges [Abstract]        
Impairment charges and other $ 0 $ 1,300 $ 9,807  
Assets Held-for-sale, Not Part of Disposal Group     $ 13,500  
Proceeds from sale of aircraft       $ 12,200