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Stock-Based Compensation (Summary of Company's Non-vested SARs Activity) (Details) (SARs [Member], USD $)
9 Months Ended
Sep. 30, 2013
SARs [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested, beginning, Shares 161,294
Granted, Shares 85,943
Vested, Shares (70,109)
Non-vested, ending, Shares 177,128
Beginning balance, Fair Value $ 31.70
Granted, Fair Value $ 42.14
Vested, Fair Value $ 30.85
Ending balance, Fair Value $ 37.11