Derivatives (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Amortization:
Accelerated amortization of deferred losses					$ 8,501
Total Amortization	(33,265)		(30,777)		(23,078)
Interest Expense | Interest Rate Contract
Interest Expense:
Hedge ineffectiveness losses (gains)	371		2,893		(101)
Amortization:
Accelerated amortization of deferred losses	2,931	[1]	0	[1]	8,508	[1]
Amortization of loss of designated interest rate derivative	1,590		101		0
Amortization of deferred losses	28,744		30,676		14,570
Total Amortization	33,265		30,777		23,078
Total charged to interest expense	33,636		33,670		22,977
Other Income (Expense):
Total charged to other income (expense)	33,636		33,670		22,977
Other Income | Interest Rate Contract
Amortization:
Total charged to interest expense	4,754		(597)		(848)
Other Income (Expense):
Mark to market gains (losses) on undesignated interest rate derivatives	4,754		(597)		(848)
Total charged to other income (expense)	$ 4,754		$ (597)		$ (848)

[1] For the year ended December 31, 2011, includes accelerated amortization of deferred hedge losses in the amount of $8,501 related to three aircraft sold in 2011. For the year ended December 31, 2013, includes accelerated amortization of deferred hedge losses related to two aircraft sold in June 2013.