Derivatives (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended					3 Months Ended	9 Months Ended
	Sep. 30, 2013 Aircraft	Sep. 30, 2013 Not Designated as Hedging Instrument	Sep. 30, 2013 Interest Rate Contract	Dec. 31, 2012 Interest Rate Contract	Sep. 30, 2013 Interest Rate Contract Interest rate derivatives designated as cash flow hedges	Sep. 30, 2013 Interest Rate Contract Not Designated as Hedging Instrument	Sep. 30, 2013 Terminated Interest Rate Contract	Sep. 30, 2013 Terminated Interest Rate Contract	Sep. 30, 2013 Term Financing No.1 -- terminated 2012 Terminated Interest Rate Contract	Sep. 30, 2013 Term Financing No.1 -- terminated 2008 Terminated Interest Rate Contract	Sep. 30, 2013 ECA Term Financings Terminated Interest Rate Contract	Sep. 30, 2013 Other Financings Terminated Interest Rate Contract
Derivative [Line Items]
Weighted Average Interest Pay Rate Of Derivatives			3.00%	2.91%
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred		$ 1,678	$ 16,077						$ 15,908	$ 1,336	$ 6,030	$ 1,329
Accrued interest payable interest rate cash flow hedge liability at fair value					827	194
Accelerated amortization of deferred losses							2,027
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (b)			13,717					24,117
Interest Rate Derivatives Deferred Gain Or Loss Expected To Be Amortized In Next Twelve Months								24,603
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion		$ 1,168
Number of Aircraft Sold With Accelerated Amortization of Hedge Losses	2