Current report filing

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

v2.4.0.8
Stock-Based Compensation (Summary Of Restricted Stock Award And Unit Activity) (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2013
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Number of Unvested Restricted Shares, beginning of period (shares) 203,348 113,386 60,244 245,831
Granted, Number of Unvested Restricted Shares (shares) 196,832 153,332 111,667 178,500
Vested, Number of Unvested Restricted Shares (shares) (135,015) (63,370) (58,525) (35,221)
Forfeited, Number of Unvested Restricted Shares (shares) (19,334) 0 0 0
Number of Unvested Restricted Shares, end of period (shares) 245,831 203,348 113,386 389,110
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Unvested Restricted Shares, Weighted Average Grant Date Fair Value, beginning of period (usd per share) $ 26.02 $ 11.72 $ 6.01 $ 31.88
Granted, Weighted Average Grant Date Fair Value (usd per share) $ 35.87 $ 31.15 $ 12.94 $ 35.80
Vested, Weighted Average Grant Date Fair Value (usd per share) $ 29.59 $ 12.87 $ 8.17 $ 36.12
Forfeited, Weighted Average Grant Date Fair Value (usd per share) $ 26.81 $ 0.00 $ 0.00 $ 0.00
Unvested Restricted stock, Weighted Average Grant Date Fair Value, end of period (usd per share) $ 31.88 $ 26.02 $ 11.72 $ 33.29