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Share-Based Compensation to Employees (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shared-based Compensation Arrangement by Shared-based Payment Award, RSUs Terminated 623,374      
Employee Benefits and Share-based Compensation $ 145 $ 81 $ 271 $ 105
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost   9,351,000    
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings   476    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 147      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   73    
Common Stock, Capital Shares Reserved for Future Issuance 50   50  
Restricted Stock Units - Maturity 1 year      
Allocated share-based compensation expense 1,830,000 10,089,000 3,766,000 10,567,000
Treasury Stock, Value 4,096      
Employee Stock Ownership Plan (ESOP), Compensation Expense 10      
Cost of Sercives [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 156,000 1,900,000 331,000 1,943,000
General and Administrative [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 1,049,000 3,650,000 2,217,000 3,921,000
Sales and Marketing [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 324,000 2,164,000 636,000 2,246,000
Technology and Development [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 301,000 $ 2,375,000 $ 582,000 $ 2,457,000
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected dividend yield     0.00%  
Expected volatility     40.00%  
Risk-free interest rate     1.81%  
Expected term (years)     5 years 6 months 20 days  
Stock Options [Member] | Long-Term Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted     79,000  
Weighted-average exercise price     $ 20.15  
Weighted-average fair value per option     $ 8.05