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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation Allowance [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 0 $ 113,729 $ 21,527
Income before taxes      
Domestic (81,316) (63,829) 46,031
Foreign (5,700) (6,799) (5,042)
Income (loss) before income taxes (87,016) (70,628) 40,989
Federal:      
Current 2,932 5,451 20,661
Deferred 2,016 82,726 43,678
State:      
Current 657 333 495
Deferred (1,198) 522 (43)
Foreign:      
Current 1,708 1,592 1,101
Deferred (2,712) (3,295) (2,041)
Provision for (benefit from) income taxes $ 3,403 $ 87,329 $ 63,851
Effective income tax rate reconciliation      
Expense (benefit) at U.S. federal statutory rate (as a percent) 21.00% 21.00% 35.00%
Expense (benefit) at state statutory rate (as a percent) 0.90% (1.20%) 0.70%
Withholding tax (as a percent) (3.50%) (7.70%) 50.10%
Foreign rate differential (as a percent) (1.10%) (0.20%) 2.80%
Research and development ("R&D") credit (as a percent) 1.20% 2.20% (3.90%)
Executive compensation (as a percent) (1.20%) (0.10%) 1.80%
Non-deductible stock-based compensation (as a percent) (2.30%) (2.80%) 14.90%
Foreign tax credit (as a percent) 3.40% 7.70% (50.10%)
Foreigh derived intangible income deduction (as a percent) 4.60% 14.80% 0.00%
Impact of corporate rate change on deferred taxes (as a percent) 0.00% 0.00% 50.60%
Divestiture (as a percent) 4.80% 0.00% 0.00%
Other (as a percent) (0.20%) 0.70% 1.40%
Valuation allowance (as a percent) (31.50%) (158.00%) 52.50%
Effective tax rate (as a percent) (3.90%) (123.60%) 155.80%
Components of net deferred tax assets      
Depreciation and amortization $ 13,995 $ 13,085  
Lease liabilities 10,734 0  
Other liabilities and reserves 9,522 8,272  
Deferred equity compensation 4,456 6,236  
Net operating loss carryovers 20,900 21,259  
Tax credits 233,407 253,890  
Total gross deferred tax assets 293,014 302,742  
Lease right-of-use assets (10,400) 0  
Convertible debt (151) (207)  
Deferred revenue (94,763) (143,182)  
Deferred Tax Liabilities, Gross (105,314) (143,389)  
Valuation allowance (196,972) (173,878)  
Total net deferred tax assets 187,700 159,353  
Net deferred tax assets reported as:      
Non-current deferred tax assets 4,574 4,435  
Non-current deferred tax liabilities (13,846) (18,960)  
Net deferred tax liabilities $ (9,272) $ (14,525)