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Income Taxes - Summary of Unrecognized Tax Benefits and Temporary Differences (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Unrecognized tax benefits    
Balance at the beginning of the period $ 270 $ 182
Increases related to current year tax positions 66 250
Decreases due to tax positions expired (6) (162)
Balance at the end of the period 330 270
Uncertain tax positions, reserved for tax exposure in Europe 300 200
Deferred tax assets:    
Unearned lease revenue 2,519 1,277
State taxes 10 152
Inventory 2,153 0
Reserves and allowances 4,356 1,988
Other accruals 1,769 4,974
Foreign tax credit 0 19
Lease liability 198 271
Net operating loss carry forward 74,045 12,091
California alternative minimum tax credit 33 0
Charitable contributions 65 57
Total deferred tax assets 85,148 20,829
Less: valuation allowance (468) (153)
Net deferred tax assets 84,680 20,676
Deferred tax liabilities:    
Depreciation and impairment on aircraft engines and equipment (163,773) (118,595)
Inventory 0 (2,350)
Notes receivable (34,426) (6,640)
Right of use liability (184) (260)
Other deferred tax assets (liabilities) (4,616) (4,198)
Net deferred tax liabilities (202,999) (132,043)
Other comprehensive loss deferred tax liability 1,481 949
Net deferred tax liabilities (116,838) $ (110,418)
Federal    
Deferred tax liabilities:    
Operating loss carryforwards 348,000  
State    
Deferred tax liabilities:    
Operating loss carryforwards 1,200  
State | California Franchise Tax Board    
Deferred tax liabilities:    
Valuation allowance of net operating loss 400  
State | Georgia Department of Revenue    
Deferred tax liabilities:    
Valuation allowance of net operating loss $ 100