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Stock Compensation Plans (Details 2) (Restricted Stock [Member], USD $)
12 Months Ended
Dec. 31, 2012
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding - beginning of year, Number of Shares 623,642
Outstanding - beginning of year, Weighted-average Grant Date Fair Value $ 31.41
Granted, Number of shares 161,905
Granted, Weighted-average Grant Date Fair Value $ 46.68
Vested, Number of shares (249,569)
Vested, Weighted-average Grant Date Fair Value $ 30.59
Canceled or expired, Number of Shares (11,914)
Canceled or expired, Weighted-average Grant Date Fair Value $ 44.34
Outstanding - end of year, Number of Shares 524,064
Outstanding - end of year, Weighted-average Grant Date Fair Value $ 36.23