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
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Employee share-based compensation expense     $ 2,831 $ 2,968
Adjustment to fair value of liability classified awards     (236) (128)
Total share-based compensation expense $ 865 $ 1,670 $ 2,595 $ 2,840