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Stock-Based Compensation (Summary of Company's Non-vested SARs Activity) (Details) - SARs [Member]
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Non-vested, beginning, Shares | shares 124,982
Vested | shares (71,514)
Forfeits | shares (961)
Non-vested, ending, Shares | shares 52,507
Beginning balance $ 45.85
Vested 41.87
Forfeits 52.02
Ending balance $ 51.17