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Share-based Compensation - Allocation of Share-based Compensation Expense and Additional Disclosures (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share-based compensation expense $ 15,328 $ 36,609 $ 42,713
Share-based compensation expense per share: Basic $ 0.20 $ 0.48 $ 0.59
Share-based compensation expense per share: Diluted $ 0.20 $ 0.48 $ 0.59
Cost of Service [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share-based compensation expense 1,734 3,673 3,546
Selling and Marketing Expense [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share-based compensation expense 1,985 5,781 6,264
General and Administrative Expense [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share-based compensation expense $ 11,609 $ 27,155 $ 32,903
2004 and 2009 Plans [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Number of shares authorized 9,700,000    
Number of shares available for grant 1,872,703    
Vesting period minimum for full vesting awards 4    
Vesting period maximum for full vesting awards 5    
Vesting period maximum for periodically vesting awards 4 years