Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Narratives) (Details)

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Stockholders' Equity (Narratives) (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized 15,700,000  
Number of shares available for grant 2,300,000  
Weighted average grant date fair value $ 9.81 $ 8.17
Share-based compensation expense $ 1,800,000 $ 1,300,000
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 27,000 32,000
Total intrinsic value 43,000 100,000
Cash received from exercise of stock options 200,000 300,000
Stock options not yet recognized 16,000  
Unvested stock options 10,000  
Weighted average period for recognition of unvested shares 0 years 6 months  
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Unrecognized share-based compensation expense $ 14,500,000  
Unvested restricted stock awards 2,200,000  
Weighted average period for recognition of unvested shares 2 years 4 months 25 days