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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Federal:      
Current $ 15,048 $ 16,595 $ 55,332
Deferred 587 (255) 255
State:      
Current (2,868) 17 1,467
Deferred 2,934 0 0
Foreign:      
Current 543 886 401
Deferred 207 9 (328)
Provision for (benefit from) income taxes 16,451 17,252 57,127
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) 0.10% (0.10%) 0.50%
Withholding tax (as a percent) 13.30% 64.20% 17.30%
Foreign rate differential (as a percent) 17.40% 33.00% 2.40%
Research and development ("R&D") credit (as a percent) 0.00% (1.00%) (0.30%)
Executive compensation (as a percent) 0.30% 2.00% 0.70%
Non-deductible stock-based compensation (as a percent) 0.70% 2.80% 0.30%
Foreign tax credit (as a percent) (13.30%) (197.70%) 0.00%
Capitalized merger and acquisition costs (as a percent) 0.30% 5.90% 0.00%
Other (as a percent) (2.20%) 0.50% (1.40%)
Valuation allowance (as a percent) 32.40% 192.30% (27.00%)
Effective tax rate (as a percent) 14.00% 66.90% 27.50%
Components of net deferred tax assets      
Depreciation and amortization 20,230 2,063  
Other liabilities and reserves 19,624 35,050  
Deferred equity compensation 64,193 58,329  
Net operating loss carryovers 38,133 8,432  
Tax credits 76,826 58,314  
Total gross deferred tax assets 219,006 162,188  
Convertible debt (8,019) (12,932)  
Total net deferred tax assets 210,987 149,256  
Valuation allowance (206,464) (140,982)  
Net deferred tax assets 4,523 8,274  
Net deferred tax assets reported as:      
Current deferred tax assets 788 2,798  
Non-current deferred tax assets 4,458 7,531  
Non-current deferred tax liabilities (723) (2,055)  
Net deferred tax assets $ 4,523 $ 8,274