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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Deferred tax assets |  |  |  |
Loss carryforwards |  | $ 419,327 | [1] | $ 405,674
Tax credits |  | 23,441 | [2] | 44,790
Accrued expenses |  | 37,609 |  | 18,774
Pension plan benefits expense |  | 7,671 |  | 7,037
Warranty reserves |  | 8,265 |  | 8,535
Depreciation and amortization |  | 64,959 |  | 72,505
Equity compensation |  | 9,362 |  | 7,061
Inventory valuation |  | 4,883 |  | 5,356
Deferred revenue |  | 12,264 |  | 13,346
Interest |  | 8,228 |  | 11,721
Leases |  | 7,173 |  | 9,543
Capitalized research costs |  | 113,465 |  | 74,058
Other deferred tax assets, net |  | 9,004 |  | 7,986
Total deferred tax assets |  | 725,651 |  | 686,386
Valuation allowance |  | (445,170) | [1] | (427,423)
Total deferred tax assets, net of valuation allowance |  | 280,481 |  | 258,963
Deferred tax liabilities |  |  |  |
Depreciation and amortization |  | (23,313) |  | (34,909)
Leases |  | (6,064) |  | (8,274)
Other deferred tax liabilities, net |  | (4,590) |  | (4,631)
Total deferred tax liabilities |  | (33,967) |  | (47,814)
Net deferred tax assets |  | 246,514 |  | $ 211,149
Deferred tax assets, tax credit carryforwards, general business | [2] | 5,400 |  |
Deferred tax assets, tax credit carryforwards, other | [2] | 41,900 |  |
U.S. federal |  |  |  |
Deferred tax liabilities |  |  |  |
Loss carryforwards by Jurisdiction | [1] | 3,600 |  |
LUXEMBOURG |  |  |  |
Deferred tax liabilities |  |  |  |
Loss carryforwards by Jurisdiction | [1] | $ 1,300,000 |  |
[1] | For tax return purposes at December 31, 2023, we had U.S. federal loss carryforwards of $3.6 million, which begin to expire in the year 2024. At December 31, 2023, we have net operating loss carryforwards in Luxembourg of $1.3 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, 2023, there was a valuation allowance of $445.2 million primarily associated with foreign loss carryforwards.
[2] | For tax return purposes at December 31, 2023, we had: U.S. general business credits of $5.4 million, which begin to expire in 2043; and state tax credits of $41.9 million, which begin to expire in 2024.

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