Derivatives (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Aircraft		Dec. 31, 2011		Dec. 31, 2010
Interest Expense:
Hedge ineffectiveness losses (gains)	$ 2,893		$ (101)		$ 5,039
Amortization:
Accelerated amortization of deferred losses(1)	0	[1]	8,508	[1]	766	[1]
Amortization of loss of designated interest rate derivative	101		0		0
Amortization of deferred (gains) losses	30,676		14,570		8,868
Total Amortization	30,777		23,078		9,634
Total charged to interest expense	33,670		22,977		14,673
Accelerated Amortization of Deferred Hedge Losses on Sold Aircraft	8,501
Number of aircraft sold with accelerated amortization of hedgel osses	3
Other Income (Expense):
Mark to market gains (losses) on undesignated hedges	(597)		(848)		(860)
Total charged to other income (expense)	$ (597)		$ (848)		$ (860)

[1] For the year ended December, 2011, includes accelerated amortization of deferred hedge losses in the amount of $8,501 related to three aircraft sold in 2011.