SCHEDULE I - Parent Company Information - Condensed Balance Sheets (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 31, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 10,076,000	$ 9,732,000	$ 13,493,000		$ 12,801,000
Equipment held for operating lease, less accumulated depreciation	1,136,603,000	1,109,168,000	1,057,381,000	$ 49,100,000
Equipment held for sale	30,710,000	23,454,000
Maintenance Rights	17,670,000	12,140,000
Operating lease related receivable, net of allowances	16,484,000	13,626,000
Spare parts inventory	25,443,000	20,826,000
Investments	45,406,000	41,295,000
Deferred income taxes	43,156,000	41,366,000
Property, equipment & furnishings, less accumulated depreciation	16,802,000	20,247,000
Intangible assets, net	2,182,000	932,000
Other assets, net	14,213,000	9,839,000
Total assets	1,337,887,000	1,294,285,000	1,245,841,000
Liabilities:
Accounts payable and accrued expenses	17,792,000	21,665,000
Derivatives		0
Deferred income taxes	104,978,000	96,154,000
Notes payable	900,255,000	866,089,000
Maintenance reserves	71,602,000	71,054,000
Security deposits	21,417,000	25,010,000
Unearned revenue	5,823,000	5,090,000
Total liabilities	1,121,867,000	1,085,062,000
Redeemable preferred stock ($0.01 par value, 1,000,000 shares authorized; 1,000,000 and nil shares issued and outstanding at December 31, 2016 and 2015, respectively)	19,760,000
Shareholders' equity:
Common stock ($0.01 par value, 20,000,000 shares authorized; 6,401,929 and 7,548,395 shares issued and outstanding at December 31, 2016 and 2015, respectively)	64,000	75,000
Paid-in capital in excess of par	2,512,000	28,720,000
Retained earnings	194,729,000	180,949,000
Accumulated other comprehensive loss, net of income (loss) tax expense (benefit)	(1,045,000)	(521,000)
Total shareholders' equity	196,260,000	209,223,000	216,648,000		212,459,000
Total liabilities, redeemable preferred stock and shareholders' equity	1,337,887,000	1,294,285,000
Parent Company
ASSETS
Cash and cash equivalents	4,574,000	2,894,000	$ 2,411,000		$ 1,520,000
Equipment held for operating lease, less accumulated depreciation	811,091,000	753,024,000
Equipment held for sale	22,446,000	10,938,000
Maintenance Rights	16,468,000	22,680,000
Operating lease related receivable, net of allowances	7,853,000	4,170,000
Spare parts inventory	17,554,000	16,420,000
Due from affiliate	24,723,000	20,286,000
Investments	45,406,000	41,295,000
Investment in subsidiaries	(2,879,000)	(1,280,000)
Property, equipment & furnishings, less accumulated depreciation	16,096,000	19,964,000
Intangible assets, net	1,021,000	271,000
Other assets, net	12,289,000	8,118,000
Total assets	976,642,000	898,780,000
Liabilities:
Accounts payable and accrued expenses	13,428,000	17,659,000
Deferred income taxes	43,265,000	37,358,000
Notes payable	626,876,000	572,759,000
Maintenance reserves	54,655,000	38,072,000
Security deposits	18,555,000	20,612,000
Unearned revenue	3,843,000	3,090,000
Total liabilities	760,622,000	689,550,000
Redeemable preferred stock ($0.01 par value, 1,000,000 shares authorized; 1,000,000 and nil shares issued and outstanding at December 31, 2016 and 2015, respectively)	19,760,000
Shareholders' equity:
Common stock ($0.01 par value, 20,000,000 shares authorized; 6,401,929 and 7,548,395 shares issued and outstanding at December 31, 2016 and 2015, respectively)	64,000	75,000
Paid-in capital in excess of par	2,512,000	28,727,000
Retained earnings	194,729,000	180,949,000
Accumulated other comprehensive loss, net of income (loss) tax expense (benefit)	(1,045,000)	(521,000)
Total shareholders' equity	196,260,000	209,230,000
Total liabilities, redeemable preferred stock and shareholders' equity	$ 976,642,000	$ 898,780,000