Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Employee share-based compensation expense $ 5,072 $ 7,243 $ 5,385
Adjustment to fair value of liability classified awards (32) (623) 1,348
Total share-based compensation expense $ 5,040 $ 6,620 $ 6,733