Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Summary of share-based compensation expense) (Details)

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Stockholders' Equity (Summary of share-based compensation expense) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Share-based compensation expense $ 4,764 $ 3,989
Adjustment to fair value of liability classified awards (35) 1
Total share-based compensation expense $ 4,729 $ 3,990