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Income Taxes - Summary of Unrecognized Tax Benefits and Temporary Differences (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Unrecognized tax benefits |  |
Balance at the beginning of the period | $ 13 | $ 330
Decreases related to current year tax positions | 11 | 0
Decreases due to tax positions expired | (5) | (317)
Balance at the end of the period | 19 | 13
Deferred tax assets: |  |
Unearned lease revenue | 3,867 | 2,217
State taxes | 2 | 0
Inventory | 2,123 | 1,486
Reserves and allowances | 4,425 | 6,781
Other accruals | 15,973 | 2,577
Lease liability | 1,366 | 146
Net operating loss carry forward | 67,595 | 68,168
California alternative minimum tax credit | 33 | 33
Charitable contributions | 2 | 2
Total deferred tax assets | 95,386 | 81,410
Less: valuation allowance | (536) | (518)
Net deferred tax assets | 94,850 | 80,892
Deferred tax liabilities: |  |
Depreciation and impairment on aircraft engines and equipment | (208,389) | (183,131)
Notes receivable | (5,479) | (15,911)
Right of use liability | (1,360) | (139)
Other deferred tax liabilities | (4,590) | (4,595)
Net deferred tax liabilities | (219,818) | (203,776)
Other comprehensive income deferred tax liability | (7,548) | (1,448)
Net deferred tax liabilities | (132,516) | $ (124,332)
Undistributed earnings of foreign subsidiaries | 6,200 |
Federal |  |
Deferred tax liabilities: |  |
Operating loss carryforwards | 315,900 |
State |  |
Deferred tax liabilities: |  |
Operating loss carryforwards | 1,300 |
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 |

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