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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
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)