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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income before taxes      
Domestic $ (12,535) $ (61,036) $ (3,586)
Foreign 518 (56,849) (22,215)
Loss before income taxes (12,017) (117,885) (25,801)
Federal:      
Current 19,319 15,048 16,595
Deferred 2,200 587 (255)
State:      
Current 47 (2,868) 17
Deferred (501) 2,934 0
Foreign:      
Current 446 543 886
Deferred 220 207 9
Provision for (benefit from) income taxes 21,731 16,451 17,252
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) (3.30%) 0.10% (0.10%)
Withholding tax (as a percent) 160.40% 13.30% 64.20%
Foreign rate differential (as a percent) 4.10% 17.40% 33.00%
Research and development ("R&D") credit (as a percent) (36.70%) 0.00% (1.00%)
Executive compensation (as a percent) 0.80% 0.30% 2.00%
Non-deductible stock-based compensation (as a percent) 2.50% 0.70% 2.80%
Foreign tax credit (as a percent) (163.30%) (13.30%) (197.70%)
Capitalized merger and acquisition costs (as a percent) 0.00% 0.30% 5.90%
Other (as a percent) (1.00%) (2.20%) 0.50%
Valuation allowance (as a percent) 252.30% 32.40% 192.30%
Effective tax rate (as a percent) 180.80% 14.00% 66.90%
Components of net deferred tax assets      
Depreciation and amortization 28,093 20,230  
Other liabilities and reserves 18,578 19,624  
Deferred equity compensation 33,837 42,546  
Net operating loss carryovers 27,416 38,133  
Tax credits 100,052 76,826  
Total gross deferred tax assets 207,976 197,359  
Convertible debt (12,664) (8,019)  
Total net deferred tax assets 195,312 189,340  
Valuation allowance (192,823) (184,817)  
Net deferred tax assets 2,489 4,523  
Net deferred tax assets reported as:      
Current deferred tax assets 205 788  
Deferred Tax Liabilities, Net (791)    
Non-current deferred tax assets 4,797 4,458  
Non-current deferred tax liabilities (1,722) (723)  
Net deferred tax assets $ 2,489 $ 4,523