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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |  |  |
Loss carryforwards |  | $ 370,120 | [1] | $ 218,420
Tax credits |  | 94,359 | [2] | 58,616
Accrued expenses |  | 43,213 |  | 23,752
Pension plan benefits expense |  | 18,086 |  | 18,262
Warranty reserves |  | 13,470 |  | 11,170
Depreciation and amortization |  | 5,709 |  | 5,736
Equity compensation |  | 5,390 |  | 5,352
Inventory valuation |  | 1,415 |  | 2,554
Deferred tax asset, deferred revenue |  | 9,062 |  | 2,431
Other deferred tax assets, net |  | 11,319 |  | 16,606
Total deferred tax assets |  | 572,143 |  | 362,899
Valuation allowance |  | (323,822) | [1] | (285,784)
Total deferred tax assets, net of valuation allowance |  | 248,321 |  | 77,115
Deferred tax liabilities |  |  |  |
Depreciation and amortization |  | (178,358) |  | (23,135)
Tax effect of accumulated translation |  | 0 |  | (303)
Other deferred tax liabilities, net |  | (6,676) |  | (5,231)
Total deferred tax liabilities |  | (185,034) |  | (28,669)
Net deferred tax assets |  | 63,287 |  | $ 48,446
Deferred tax assets, tax credit carryforwards, general business | [2] | 31,200 |  |
Deferred tax assets, tax credit carryforwards, alternative minimum tax | [2] | 1,600 |  |
Deferred tax assets, tax credit carryforwards, foreign | [2] | 50,400 |  |
Deferred tax assets, tax credit carryforwards, other | [2] | 35,100 |  |
U.S. federal |  |  |  |
Deferred tax liabilities |  |  |  |
Loss carryforwards by Jurisdiction | [1] | 350,700 |  |
LUXEMBOURG |  |  |  |
Deferred tax liabilities |  |  |  |
Loss carryforwards by Jurisdiction | [1] | $ 936,700 |  |
[1] | For tax return purposes at December 31, 2018, we had U.S. federal loss carryforwards of $350.7 million which begin to expire in the year 2019. At December 31, 2018, we have net operating loss carryforwards in Luxembourg of $936.7 million, 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, 2018, there was a valuation allowance of $323.8 million primarily associated with foreign loss carryforwards and foreign tax credit carryforwards (discussed below).
[2] | For tax return purposes at December 31, 2018, we had: (1) U.S. general business credits of $31.2 million, which begin to expire in 2022; (2) U.S. alternative minimum tax credits of $1.6 million that can be carried forward indefinitely; (3) U.S. foreign tax credits of $50.4 million, which begin to expire in 2024; and (4) state tax credits of $35.1 million, which begin to expire in 2019.

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