Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Narratives) (Details)

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Stockholders' Equity (Narratives) (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant 2,300,000  
Weighted average grant date fair value $ 9.89 $ 8.22
Share-based compensation expense $ 4,000,000 $ 2,900,000
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Unrecognized share-based compensation expense 12,500,000  
Unvested restricted stock awards 2,200,000  
Weighted average period for recognition of unvested shares 2 years 1 month 6 days  
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years  
Expiration period 10 years  
Options vested in period fair value 50,000 23,000
Total intrinsic value 46,000 100,000
Cash received from exercise of stock options 200,000 300,000
Stock options not yet recognized $ 8,000  
Unvested stock options 3,000  
Weighted average period for recognition of unvested shares 0 years 7 months 6 days  
Common Stock - Class A [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized 15,700,000