Investments (Details) $ in Thousands		1 Months Ended		12 Months Ended	60 Months Ended
	Sep. 18, 2013 USD ($) item	Jun. 30, 2011 item	Dec. 31, 2005 USD ($) item	Dec. 31, 2015 USD ($) engine item	Dec. 31, 2015 USD ($) engine	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 16, 2013	May. 25, 2011 USD ($)
Investments
Investment in joint venture				$ 41,295	$ 41,295	$ 41,590	$ 23,485
WOLF
Investments
Previously held interest (as a percent)								50.00%
Acquisition of the remaining outstanding shares (as a percent)	50.00%
Purchase price consideration	$ 1,000
Discount from JV partner's equity interest	$ 12,700
Number of aircraft engines acquired | item	8
Number of aircraft airframes acquired | item	2
Fair value of the net assets acquired	$ 12,600
Amount of equipment acquired	27,000
Amount of cash and receivables acquired	1,600
Amount of debt and other liabilities	$ 16,000
Controlling interest assumed (as a percent)	100.00%
WMES
Investments
Initial capital contribution									$ 8,000
Additional capital contributions				$ 600	$ 21,000
Number of engines transferred to the joint venture | item		7
Number of engines purchased | engine					21
Number of engines in lease portfolio | engine				28
Capital contributions to date				$ 29,000	$ 29,000
Proportionate gain on sale of engines to joint venture interest which is off-set against investments				3,600
Net investment after deducting partial offset				25,400	25,400
Gain on sale of engines				7,200
Investment in joint venture				27,272	27,272	26,672	$ 23,485
Reduction Of Net Investment				$ 2,100
WOLF
Investments
Previously held interest (as a percent)								50.00%
Number of engines in lease portfolio | item				8
Number of Airbus A340-313 aircraft purchased | item			2
Purchase price of aircraft			$ 96,000
Number of aircraft leased to Emirates | item			2
CASC Willis
Investments
Investment in joint venture				$ 14,023	$ 14,023	$ 14,918