Maintenance Reserves and Accrued Maintenance Costs (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Lease	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2011
Maintenance Reserves and Accrued Maintenance Costs [Abstract]
Proceeds from lease payments included in refundable maintenance reserves	$ 6,528,500
Number of aircraft leases assigned to new lessee	2
Refundable maintenance reserves	14,477,400	8,509,500
Accrued maintenance costs	878,700	2,608,200	985,500	1,013,400
Total	$ 15,356,100	$ 11,117,700