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Income Taxes - Reconciliation to Statutory Tax Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes      
Income tax expense (benefit) at U.S. statutory rates $ (91,105) $ (31,147) $ (41,722)
State taxes, net of U.S. federal impact (2,848) (2,523) (1,963)
Effect of international operations 11,847 10,158 8,798
Research and development tax credit (2,230) 620 (801)
Net change in valuation allowance 7,747 1,883 50,544
Change in accrual for unrecognized tax benefits 2,868 (4,772) (1,700)
Subsidiary liquidation     (12,435)
Share-based compensation 1,848 99 2,133
Effect of 2017 Tax Act 1,690 11,344  
Asset impairment 46,872    
Other (55) (568) (31)
Total expense (benefit) for income taxes $ (26,746) $ (37,594) $ 2,823