Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Receivables, allowances	$ 1,154	$ 1,372
Redeemable preferred stock - par value (in dollars per share)	$ 0.01	$ 0.01
Redeemable preferred stock - shares authorized (in shares)	2,500,000	2,500,000
Redeemable preferred stock - shares issued (in shares)	2,500,000	2,500,000
Redeemable preferred stock - shares outstanding (in shares)	2,500,000	2,500,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	6,531,000	6,570,000
Accumulated other comprehensive income (loss), income tax expense (benefit)	$ 1,469	$ (1,428)
Restricted cash	81,312	36,385
Maintenance rights	22,511	20,097
Spare parts inventory	50,959	59,434
Notes receivable	115,456	158,708
Other assets	51,975	43,778
Debt obligations	1,790,264	1,693,753
Variable Interest Entity
Restricted cash	81,312	35,262
Equipment	1,226,395	1,037,684
Maintenance rights	5,433	767
Spare parts inventory	4,367	5,437
Notes receivable	90,868	26,392
Other assets	4,775	558
Debt obligations	1,197,922	907,550
Equipment Held For Operating Lease
Accumulated depreciation	524,968	454,123
Property, Equipment, and Furnishings
Accumulated depreciation	$ 13,484	$ 11,356