Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Summary Of Restricted Stock Award And Unit Activity) (Details)

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Stock-Based Compensation (Summary Of Restricted Stock Award And Unit Activity) (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Share-based Compensation [Abstract]  
Number of Unvested Restricted Shares as of December 31, 2011 203,348
Unvested Restricted Shares, Weighted Average Grant Date Fair Value as of December 31, 2011 $ 26.02
Granted, Number of Unvested Restricted Shares 167,500
Granted, Weighted Average Grant Date Fair Value $ 37.36
Vested, Number of Unvested Restricted Shares (66,474)
Vested, Weighted Average Grant Date Fair Value $ 30.15
Number of Unvested Restricted Shares as of June 30, 2012 304,374
Unvested Restricted Shares, Weighted Average Grant Date Fair Value as of June 30, 2012 $ 31.36