Lease Rental Revenues and Flight Equipment Held for Lease (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Lessee Aircraft	Mar. 31, 2012 Lessee	Dec. 31, 2012 Aircraft
Revenue, Major Customer [Line Items]
Number of Offlease 767-300ER Aircraft being Marketed for Lease or Sale	1		1
Entity-Wide Revenue, Major Customer, Number	1	1
Number of Lessees With 5% of Lease Rental Revenue	2	4
Lease Rental Revenues and Flight Equipment Held for Lease (Textual) [Abstract]
Amounts of lease incentive liabilities recorded in the consolidated balance sheets	$ 15,488		$ 15,587
Customer One [Member]
Revenue, Major Customer [Line Items]
Percentage of lease rental revenues accounted by customers	6.00%	10.00%
Customer Group Three [Member]
Revenue, Major Customer [Line Items]
Percentage of lease rental revenues accounted by customers	12.00%	26.00%
Other Customer [Member]
Revenue, Major Customer [Line Items]
Percentage of lease rental revenues accounted by customers	5.00%	5.00%