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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Federal:                      
Current                 $ 16,595 $ 55,332 $ (957)
Deferred                 (255) 255  
State:                      
Current                 17 1,467 9
Foreign:                      
Current                 886 401 761
Deferred                 9 (328) (354)
Provision for (benefit from) income taxes 4,308 4,080 2,088 6,776 4,617 4,441 2,393 45,676 17,252 57,127 (541)
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%) 0.50% (5.40%)
Withholding tax (as a percent)                 64.20% 17.30%  
Foreign rate differential (as a percent)                 33.00% 2.40%  
Research and development ("R&D") credit (as a percent)                 (1.00%) (0.30%) (0.90%)
Executive compensation (as a percent)                 2.00% 0.70%  
Non-deductible stock-based compensation (as a percent)                 2.80% 0.30% 0.80%
Foreign tax credit (as a percent)                 (197.70%)    
Capitalized merger and acquisition costs (as a percent)                 5.90%    
Other (as a percent)                 0.50% (1.40%) 0.70%
Valuation allowance (as a percent)                 192.30% (27.00%) 39.20%
Effective tax rate (as a percent)                 66.90% 27.50% (0.60%)
Components of net deferred tax assets                      
Depreciation and amortization 2,063       3,465       2,063 3,465  
Other liabilities and reserves 35,050       13,220       35,050 13,220  
Deferred equity compensation 58,329       52,077       58,329 52,077  
Net operating loss carryovers 8,432       8,432       8,432 8,432  
Tax credits 58,314       18,121       58,314 18,121  
Total gross deferred tax assets 162,188       95,315       162,188 95,315  
Convertible debt (12,932)       (16,961)       (12,932) (16,961)  
Total net deferred tax assets 149,256       78,354       149,256 78,354  
Valuation allowance (140,982)       (75,413)       (140,982) (75,413)  
Net deferred tax assets 8,274       2,941       8,274 2,941  
Net deferred tax assets reported as:                      
Current deferred tax assets 2,798       2,420       2,798 2,420  
Non-current deferred tax assets 7,531       2,974       7,531 2,974  
Non-current deferred tax liabilities (2,055)       (2,453)       (2,055) (2,453)  
Net deferred tax assets $ 8,274       $ 2,941       $ 8,274 $ 2,941