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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income tax provision at the federal statutory rate of 21% (35% for 2017) $ 103,847 $ 159,927 $ 23,435
State income taxes, net of effect of federal tax benefit 6,146 16,794 782
Stock-based compensation (135,179) (129,654) (358,901)
Research credits (33,377) (14,276) (6,947)
Realization of certain deferred tax assets (9,281) (13,200) (3,133)
Foreign income taxed at a different statutory tax rate (3,333) (3,206) (14,725)
Deferred tax adjustment for enacted changes in tax laws and rates 890 (7,488) 705
Non-deductible impairments for certain cost method investments     2,669
Transition tax 0 (9,190) 62,667
Withholding taxes 7,304 5,165 562
Other, net 13,674 (1,061) 1,836
Income tax (benefit) provision $ (49,309) $ 3,811 $ (291,050)