Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Stock-Based Compensation (Summary Of Restricted Stock Unit Activity) (Details) (Restricted Stock Units [Member], USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units outstanding, Beginning, Number of Shares 328,795 286,520 260,509
Granted, Number of Shares 145,768 128,525 136,327
Vested, Number of Shares (146,951) (62,417) (65,935)
Forfeited, Number of Shares (30,860) (23,833) (44,381)
Restricted stock units outstanding, Ending, Number of Shares 296,752 328,795 286,520
Restricted stock units outstanding, Beginning, Weighted Average Grant Date Fair Value Per Share $ 37.63 $ 36.35 $ 46.32
Granted, Weighted Average Grant Date Fair Value Per Share $ 58.37 $ 43.95 $ 27.14
Vested, Weighted Average Grant Date Fair Value Per Share $ 38.01 $ 42.95 $ 53.41
Forfeited, Weighted Average Grant Date Fair Value Per Share $ 41.79 $ 42.44 $ 41.22
Restricted stock units outstanding, Ending, Weighted Average Grant Date Fair Value Per Share $ 47.19 $ 37.63 $ 36.35