Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Details)

v2.4.0.6
Stock-Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Restricted Stock Units [Member]
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Unrecognized costs related to share based compensation $ 13,712  
Weighted average period of recognition of unrecognized costs related to stock options, years 2 years 10 months 28 days  
Restricted stock units granted (in shares) 128,989 149,691
Stock Option [Member]
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Stock options granted (in shares) 298,805 323,615
Unrecognized costs related to share based compensation $ 7,588  
Weighted average period of recognition of unrecognized costs related to stock options, years 2 years 10 months 2 days