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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred tax assets |  |  |  |
Loss carryforwards |  | $ 423,013 | [1] | $ 343,614
Tax credits |  | 88,433 | [2] | 98,098
Accrued expenses |  | 47,569 |  | 46,846
Pension plan benefits expense |  | 21,735 |  | 17,310
Warranty reserves |  | 11,083 |  | 12,961
Depreciation and amortization |  | 6,363 |  | 6,112
Equity compensation |  | 4,701 |  | 4,685
Inventory valuation |  | 1,799 |  | 1,069
Deferred revenue |  | 9,705 |  | 8,951
Leases |  | 10,872 |  | 13,876
Other deferred tax assets, net |  | 10,817 |  | 9,777
Total deferred tax assets |  | 636,090 |  | 563,299
Valuation allowance |  | (503,859) | [1] | (427,030)
Total deferred tax assets, net of valuation allowance |  | 132,231 |  | 136,269
Deferred tax liabilities |  |  |  |
Depreciation and amortization |  | (39,995) |  | (54,663)
Leases |  | (10,046) |  | (12,976)
Other deferred tax liabilities, net |  | (7,969) |  | (6,540)
Total deferred tax liabilities |  | (58,010) |  | (74,179)
Net deferred tax assets |  | 74,221 |  | $ 62,090
Deferred tax assets, tax credit carryforwards, general business | [2] | 46,900 |  |
Deferred tax assets, tax credit carryforwards, foreign | [2] | 50,800 |  |
Deferred tax assets, tax credit carryforwards, other | [2] | 38,200 |  |
U.S. federal |  |  |  |
Deferred tax liabilities |  |  |  |
Loss carryforwards by Jurisdiction | [1] | 125,300 |  |
LUXEMBOURG |  |  |  |
Deferred tax liabilities |  |  |  |
Loss carryforwards by Jurisdiction | [1] | $ 1,400,000 |  |
[1] | For tax return purposes at December 31, 2020, we had U.S. federal loss carryforwards of $125.3 million, which begin to expire in the year 2021. At December 31, 2020, we have net operating loss carryforwards in Luxembourg of $1.4 billion, the majority of which can be carried forward indefinitely, offset by a full valuation allowance. The remaining portion of the loss carryforwards are composed primarily of losses in various other state and foreign jurisdictions. The majority of these losses can be carried forward indefinitely. At December 31, 2020, there was a valuation allowance of $503.9 million primarily associated with foreign loss carryforwards and foreign tax credit carryforwards (discussed below).
[2] | For tax return purposes at December 31, 2020, we had: (1) U.S. general business credits of $46.9 million, which begin to expire in 2022; (2) U.S. foreign tax credits of $50.8 million, which begin to expire in 2024; and (3) state tax credits of $38.2 million, which begin to expire in 2021.

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