Derivatives (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Interest Expense:
Hedge ineffectiveness gains	$ 1,885		$ (123)		$ 366		$ (598)
Accelerated Amortization of Deferred Hedge Losses	0	[1]	1,847	[1]	0	[1]	1,847	[1]
Accelerated Amortization of Deferred Hedge Losses on Sold Aircraft			1,839		1,839		1,839
Amortization:
Amortization of deferred losses	8,866		3,544		12,937		6,379
Total Amortization	8,866		5,391		12,937		8,226
Total charged to interest expense	10,751		5,268		13,303		7,628
Other Income (Expense):
Mark to market gains (losses) on undesignated interest rate derivatives	712		(257)		599		(616)
Total charged to other income (expense)	$ 712		$ (257)		$ 599		$ (616)

[1] For the three and six months ended June 30, 2011, includes accelerated amortization of deferred hedge losses in the amount of $1,839 related to an aircraft sold in June 2011.