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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, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Tax (expense) benefit at the United States statutory rate   $ (19,824) $ (25,460) $ 16,121
Permanent differences   (20,543) 20,686 (13,216)
State income tax benefit, net of federal tax effect   4,005 (335) (1,154)
Tax effect of foreign income taxed at lower rate   (23,895) 16,683 34,711
Change in valuation allowance   (35,500) (98,414) (139,375)
Effect of tax contingencies   12,966 5,203 11,198
Tax credits   36,981 37,769 47,348
Withholding taxes   (6,815) (57,190) 4,678
U.S. tax on repatriated earnings   0 0 (875)
Impairments   0 (649) 0
Transition tax on unremitted earnings $ 0 0   (160,567)
Tax effect of rate changes   0 0 82,392
Change in valuation allowance   14,969 9,354 202,758
State income tax benefit, net of federal tax effect   (4,104) (5,350) 8,360
GILTI   (38,305) (34,650) 0
Other   (591) 582 610
Total income tax (expense) benefit   $ (80,656) $ (131,771) $ 92,989