Lease Rental Revenues and Flight Equipment Held for Lease (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
Revenue attributable to individual countries
Percent of Total Revenue	10.00%		10.00%		10.00%		10.00%
Maintenance Revenue from Danish Lessee	$ 7,656
United States [Member]
Revenue attributable to individual countries
Revenue	0	[1]	16,683	[1]	43,681		33,418
Percent of Total Revenue	0.00%	[1]	11.00%	[1]	13.00%		11.00%
Number of Lessees, duration	0	[1]	4	[1]	6		4
China [Member]
Revenue attributable to individual countries
Revenue	18,638		16,128		36,857		32,401
Percent of Total Revenue	11.00%		11.00%		11.00%		11.00%
Number of Lessees, duration	4		4		4		5
Russia [Member]
Revenue attributable to individual countries
Revenue	17,376	[2]			32,807	[3]
Percent of Total Revenue	10.00%	[2]			10.00%	[3]
Number of Lessees, duration	8	[2]			8	[3]
Denmark [Member]
Revenue attributable to individual countries
Revenue	$ 16,523	[2]
Percent of Total Revenue	10.00%	[2]
Number of Lessees, duration	2	[2]

[1] Total revenue attributable to the United States was less then 10% for the three months ended June 30, 2012.

[2] Total revenue attributable to Russia and Denmark were less than 10% for the three months ended June 30, 2011. Total revenue attributable to Denmark for the three months ended June 30, 2012 includes $7,656 of maintenance revenue.

[3] Total revenue attributable to Russia was less than 10% for the three months ended June 30, 2011.