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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation Allowance [Line Items]        
Deferred Tax Liabilities, Net     $ (4,475)  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ (174,456)      
Income before taxes        
Domestic   $ 58,498 49,173 $ (12,535)
Foreign   1,733 1,077 518
Income before income taxes   60,231 50,250 (12,017)
Federal:        
Current   20,497 19,386 19,319
Deferred   (170,798) 2,337 2,200
State:        
Current   609 713 47
Deferred   (1,933) 0 (501)
Foreign:        
Current   443 1,640 446
Deferred   25 (27) 220
Provision for (benefit from) income taxes   $ (151,157) $ 24,049 $ 21,731
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)   (1.50%) 1.00% (3.30%)
Withholding tax (as a percent)   34.10% 38.60% 160.40%
Foreign rate differential (as a percent)   0.40% 2.50% 4.10%
Research and development ("R&D") credit (as a percent)   (2.30%) (6.10%) (36.70%)
Executive compensation (as a percent)   0.50% 0.20% 0.80%
Non-deductible stock-based compensation (as a percent)   5.30% 1.40% 2.50%
Foreign tax credit (as a percent)   (34.10%) (38.70%) (163.30%)
Other (as a percent)   (0.60%) 0.60% (1.00%)
Valuation allowance (as a percent)   (287.80%) 13.40% 252.30%
Effective tax rate (as a percent)   (251.00%) 47.90% 180.80%
Components of net deferred tax assets        
Depreciation and amortization   $ 30,019 $ 29,099  
Other liabilities and reserves   7,227 9,916  
Deferred equity compensation   23,176 29,511  
Net operating loss carryovers   11,746 12,307  
Tax credits   117,078 116,658  
Total gross deferred tax assets   189,246 197,491  
Convertible debt   (6,044) (8,092)  
Total net deferred tax assets   183,202 189,399  
Valuation allowance   (20,717) (193,874)  
Net deferred tax assets   162,485    
Net deferred tax assets reported as:        
Current deferred tax assets   0 187  
Deferred Tax Liabilities, Net   0 (1,131)  
Non-current deferred tax assets   162,485 536  
Non-current deferred tax liabilities   0 $ (4,067)  
Net deferred tax assets   $ 162,485