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Stock-Based Compensation (Restricted Stock Unit Activity) (Details) (Restricted Stock Units R S U [Member], USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock Units R S U [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units Outstanding at beginning of year 710,591 596,648 546,876
Units granted 178,144 200,819 162,552
Shares issued (108,170) (82,982) (85,676)
Units forfeited (8,243) (3,894) (27,104)
Units Outstanding at end of year 772,322 710,591 596,648
Units vested at end of year 303,781 244,897 222,529
Outstanding at beginning of year, Weighted Average Fair Value at Date of Grant $ 29.53 $ 25.78 $ 22.77
Units granted, Weighted Average Fair Value at Date of Grant $ 43.36 $ 40.15 $ 35.70
Shares Issued, Weighted Average Fair Value at Date of Grant $ 29.74 $ 28.10 $ 25.26
Units forfeited, Weighted Average Fair Value at Date of Grant $ 41.22 $ 34.44 $ 26.25
Outstanding at end of year, Weighted Average Fair Value at Date of Grant $ 32.57 $ 29.53 $ 25.78
Units vested at end of year, Weighted Average Fair Value at Date of Grant $ 24.85 $ 24.03 $ 23.20