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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (310,407) $ (385,785)
Other comprehensive income (loss), net of tax    
Unrealized gain (loss) on marketable securities, net of tax 309 43
Foreign currency translation (3,524) 6,763
Total other comprehensive income (loss), net of tax (3,215) 6,806
Total comprehensive income (loss) $ (313,622) $ (378,979)