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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (Parentheticals) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Non-cash investing and financing activities:    
Entered into notes payable to finance the purchase of aircraft $ 5,738 $ 2,616
Entered into capital leases to finance the purchase of aircraft and information systems hardware 548 2,707
Settlement of notes payable in exchange for the aircraft securing the debt $ 2,616 $ 3,570