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Income Taxes - Reconciliations of the Reported Income Tax Expense by Applying United States federal Statutory Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Tax (expense) benefit at the United States statutory rate |  | $ (26,971) | $ 24,718 | $ (128,482)
Permanent differences |  | 21,704 | (21,628) | (21,636)
State income tax benefit, net of federal tax effect |  | (335) | (1,154) | 1,510
Tax effect of foreign income taxed at lower rate |  | 16,843 | 34,652 | 71,347
Change in valuation allowance |  | (74,267) | (111,856) | (47,863)
Effect of tax contingencies |  | 4,985 | 10,980 | 26,610
Tax credits |  | 13,688 | 19,829 | 19,399
Withholding taxes |  | (58,095) | 3,901 | (26,163)
U.S. tax on repatriated earnings |  | 0 | (875) | (67,796)
Impairments |  | (649) | 0 | 0
Sale of subsidiaries |  | 0 | 0 | 139,335
Transition tax on unremitted earnings | $ (160,567) |  |  | 0
Tax effect of rate changes | $ 82,400 | 0 | 82,392 | 0
Change in valuation allowance |  | 9,354 | 201,946 | 0
State income tax benefit, net of federal tax effect |  | (5,350) | 8,360 | 0
GILTI |  | (34,650) | 0 | 0
Other |  | 583 | 610 | (701)
Total income tax (expense) benefit |  | $ (133,160) | $ 91,308 | $ (34,440)

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