Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unrecognized tax benefits
Balance at the beginning of the period	$ 406,000	$ 308,000
Increases related to current year tax positions	160,000	98,000
Balance at the end of the period	566,000	406,000
Uncertain tax positions, reserved resulting from the extraterritorial income exclusion	200,000
Uncertain tax positions, reserved for tax exposure in Europe	0	100,000	200,000
Deferred tax assets:
Unearned lease revenue	1,134,000	1,550,000
State taxes	532,000	706,000
Reserves and allowances	853,000	1,596,000
Other accruals	1,048,000	962,000
Alternative minimum tax credit	377,000	542,000
Net operating loss carry forward	36,778,000	32,470,000
Charitable contributions	17,000	18,000
Total deferred tax assets	40,739,000	37,844,000
Deferred tax liabilities:
Depreciation and impairment on aircraft engines and equipment	(125,675,000)	(124,292,000)
Other deferred tax liabilities	(1,575,000)	(4,451,000)
Net deferred tax liabilities	(127,250,000)	(128,743,000)
Other comprehensive income, deferred tax asset	(174,000)	261,000
Net deferred tax liabilities	$ (86,685,000)	$ (90,638,000)