Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Stock-Based Compensation (Summary Of Restricted Stock Award And Unit Activity) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock-Based Compensation [Abstract]      
Number of Unvested Restricted Shares, beginning of period 113,386 60,244 93,456
Unvested restricted Shares, Weighted Average Grant Date Fair Value, beginning of period $ 11.72 $ 6.01 $ 7.04
Granted, Number of Unvested Restricted Shares 153,332 111,667 13,332
Granted, Weighted Average Grant Date Fair Value $ 31.15 $ 12.94 $ 8.08
Vested, Number of Unvested Restricted Shares (63,370) (58,525) (43,458)
Vested, Weighted Average Grant Date Fair Value $ 12.87 $ 8.17 $ 8.16
Forfeited, Number of Unvested Restricted Shares     (3,086)
Forfeited, Weighted Average Grant Date Fair Value     $ 15.77
Number of Unvested Restricted Shares, end of period 203,348 113,386 60,244
Unvested restricted stock, Weighted Average Grant Date Fair Value, end of period $ 26.02 $ 11.72 $ 6.01