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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Reserves and accrued expenses | $ 121,509 | $ 186,120
Inventories | 5,094 | 8,967
Net operating loss carryforwards | 71,774 | 87,010
R&D credits | 9,570 | 7,933
Foreign tax credits | 0 | 9,203
Valuation allowance | (25,690) | (26,009)
Total deferred tax assets | 182,257 | 273,224
Deferred tax liabilities: |  |
Reserves and accrued expenses | 39,566 | 13,915
Amortizable intangible assets | 935,874 | 1,400,792
Plant and equipment | 5,748 | 6,102
Total deferred tax liabilities | $ 981,188 | $ 1,420,809

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