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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation Allowance [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ (174,456)      
Income before taxes        
Domestic   $ 38,211 $ 58,498 $ 49,173
Foreign   (15,574) 1,733 1,077
Income before income taxes   22,637 60,231 50,250
Federal:        
Current   22,115 20,497 19,386
Deferred   (2,198) (170,798) 2,337
State:        
Current   884 609 713
Deferred   (271) (1,933) 0
Foreign:        
Current   1,275 443 1,640
Deferred   (5,988) 25 (27)
Provision for (benefit from) income taxes   $ 15,817 $ (151,157) $ 24,049
Effective income tax rate reconciliation        
Expense (benefit) at U.S. federal statutory rate (as a percent)   35.00% 35.00% 35.00%
Expense (benefit) at state statutory rate (as a percent)   1.80% (1.50%) 1.00%
Withholding tax (as a percent)   97.00% 34.10% 38.60%
Foreign rate differential (as a percent)   4.10% 0.40% 2.50%
Research and development ("R&D") credit (as a percent)   (8.30%) (2.30%) (6.10%)
Executive compensation (as a percent)   1.50% 0.50% 0.20%
Non-deductible stock-based compensation (as a percent)   34.80% 5.30% 1.40%
Foreign tax credit (as a percent)   (97.00%) (34.10%) (38.70%)
Other (as a percent)   1.00% (0.60%) 0.60%
Valuation allowance (as a percent)   0.00% (287.80%) 13.40%
Effective tax rate (as a percent)   69.90% (251.00%) 47.90%
Components of net deferred tax assets        
Depreciation and amortization   $ 22,174 $ 30,019  
Other liabilities and reserves   12,442 7,227  
Deferred equity compensation   17,426 23,176  
Net operating loss carryovers   11,439 11,746  
Tax credits   120,660 117,078  
Total gross deferred tax assets   184,141 189,246  
Convertible debt   (3,870) (6,044)  
Total net deferred tax assets   180,271 183,202  
Valuation allowance   (23,529) (20,717)  
Net deferred tax assets   156,742 162,485  
Net deferred tax assets reported as:        
Non-current deferred tax assets   168,342 162,485  
Non-current deferred tax liabilities   (11,600) 0  
Net deferred tax assets   $ 156,742 $ 162,485