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Stock-Based Compensation (Summary of Company's Non-vested SARs Activity) (Details) (SARs [Member], USD $)
3 Months Ended
Mar. 31, 2014
SARs [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested, beginning, Shares 177,128
Granted, Shares 37,213
Vested, Shares (89,359)
Non-vested, ending, Shares 124,982
Beginning balance, Fair Value $ 37.11
Granted, Fair Value $ 61.64
Vested, Fair Value $ 35.09
Ending balance, Fair Value $ 45.85