Consolidated Statements of Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REVENUE
Lease rent revenue													$ 101,737	$ 94,591	$ 104,663
Maintenance reserve revenue													46,694	41,387	39,161
Gain on sale of leased equipment													5,675	5,499	11,110
Other revenue													4,306	6,613	1,719
Total revenue	47,203	37,952	37,953	35,304	39,692	37,506	35,153	35,739	37,669	39,480	38,692	40,812	158,412	148,090	156,653
EXPENSES
Depreciation and amortization expense													58,727	52,591	51,250
Write-down of equipment													6,461	5,874	3,341
General and administrative													33,868	34,551	35,701
Technical expense													12,863	7,006	8,394
Net finance costs:
Interest expense													38,719	31,749	35,201
Interest income														(80)	(167)
Loss on debt extinguishment and derivatives termination														15,462	343
Total net finance costs													38,719	47,131	35,377
Total expenses													150,638	147,153	134,063
Earnings from operations													7,774	937	22,590
Earnings from joint ventures													3,526	1,759	1,295
Income before income taxes													11,300	2,696	23,885
Income tax benefit (expense)													4,326	(1,161)	(9,377)
Net income	6,553	(2,229)	9,692	1,610	2,211	(7,194)	3,229	3,289	3,648	2,316	3,481	5,063	15,626	1,535	14,508
Preferred stock dividends														2,493	3,128
Preferred stock redemption costs														2,835
Net income (loss) attributable to common shareholders	$ 6,553	$ (2,229)	$ 9,692	$ 1,610	$ (771)	$ (7,976)	$ 2,447	$ 2,507	$ 2,866	$ 1,534	$ 2,699	$ 4,281	$ 15,626	$ (3,793)	$ 11,380
Basic earnings (loss) per common share: (in dollars per share)	$ 0.84	$ (0.29)	$ 1.20	$ 0.20	$ (0.09)	$ (0.94)	$ 0.29	$ 0.30	$ 0.34	$ 0.18	$ 0.33	$ 0.5	$ 1.95	$ (0.45)	$ 1.35
Diluted earnings (loss) per common share: (in dollars per share)	$ 0.81	$ (0.28)	$ 1.17	$ 0.19	$ (0.09)	$ (0.91)	$ 0.28	$ 0.29	$ 0.33	$ 0.17	$ 0.31	$ 0.47	$ 1.89	$ (0.43)	$ 1.28
Average common shares outstanding (in shares)	7,846	8,126	8,106	8,033	8,277	8,667	8,585	8,404	8,425	8,397	8,322	8,552	8,029	8,490	8,423
Diluted average common shares outstanding (in shares)	8,084	8,329	8,303	8,273	8,525	8,889	8,848	8,756	8,758	8,811	8,796	9,048	8,289	8,791	8,876