Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Aircraft	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Fair Value Measurements (Textual) [Abstract]
Asset Impairment Charges	$ 10,111	$ 5,200	$ 10,111	$ 5,200
Maintenance Revenue from Terminated Leases and Scheduled Lease Expirations	2,447	2,267
Lease Incentive Accrual Reversed		$ 878
Number of Impaired Aircraft	2
Aircraft Impaired and Subsequently Sold	1
Aircraft Returned from Lessee and Subsequently Impaired	1