Consolidated Statements of Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	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, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUE
Lease rent revenue													$ 94,591	$ 104,663	$ 102,133
Maintenance reserve revenue													41,387	39,161	34,776
Gain on sale of leased equipment													5,499	11,110	7,990
Other revenue													6,613	1,719	3,403
Total revenue	39,692	37,506	35,153	35,739	37,669	39,480	38,692	40,812	39,634	40,191	32,778	35,699	148,090	156,653	148,302
EXPENSES
Depreciation expense													52,591	51,250	48,704
Write-down of equipment													5,874	3,341	2,874
General and administrative													34,551	35,701	29,302
Technical expense													7,006	8,394	8,118
Net finance costs:
Interest expense													31,749	35,201	40,945
Interest income													(80)	(167)	(212)
Loss on debt extinguishment and derivatives termination													15,462	343
Total net finance costs													47,131	35,377	40,733
Total expenses													147,153	134,063	129,731
Earnings from operations													937	22,590	18,571
Earnings from joint ventures													1,759	1,295	1,109
Income before income taxes													2,696	23,885	19,680
Income tax expense													(1,161)	(9,377)	(7,630)
Net income	2,211	(7,194)	3,229	3,289	3,648	2,316	3,481	5,063	4,010	3,083	1,907	3,050	1,535	14,508	12,050
Preferred stock dividends													2,493	3,128	3,128
Preferred stock redemption costs													2,835
Net income (loss) attributable to common shareholders	$ (771)	$ (7,976)	$ 2,447	$ 2,507	$ 2,866	$ 1,534	$ 2,699	$ 4,281	$ 3,228	$ 2,301	$ 1,125	$ 2,268	$ (3,793)	$ 11,380	$ 8,922
Basic earnings (loss) per common share: (in dollars per share)	$ (0.09)	$ (0.94)	$ 0.29	$ 0.30	$ 0.34	$ 0.18	$ 0.33	$ 0.50	$ 0.37	$ 0.27	$ 0.13	$ 0.26	$ (0.45)	$ 1.35	$ 1.03
Diluted earnings (loss) per common share: (in dollars per share)	$ (0.09)	$ (0.91)	$ 0.28	$ 0.29	$ 0.33	$ 0.17	$ 0.31	$ 0.47	$ 0.35	$ 0.25	$ 0.12	$ 0.24	$ (0.43)	$ 1.28	$ 0.96
Average common shares outstanding (in shares)	8,277	8,667	8,585	8,404	8,425	8,397	8,322	8,552	8,654	8,683	8,729	8,660	8,490	8,423	8,681
Diluted average common shares outstanding (in shares)	8,525	8,889	8,848	8,756	8,758	8,811	8,796	9,048	9,199	9,080	9,255	9,303	8,791	8,876	9,251