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Stock-Based Compensation (Summary of Company's SARs Activity) (Details) - SARs [Member] - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning balance 353,955  
Exercised, Shares (37,834)  
Forfeits (1,204)  
Ending balance 314,917 353,955
Exercisable, Shares 262,410  
Outstanding, Weighted Average Exercise Price $ 35.52  
Exercised, Weighted Average Exercise Price 28.56  
Forfeits, Weighted Average Exercise Price 53.96  
Outstanding, Weighted Average Exercise Price 36.28 $ 35.52
Exercisable, Weighted Average Exercise Price $ 33.30  
Outstanding, Average Remaining Contractual Term Years 6 years 2 months 8 days 6 years 9 months 7 days
Exercisable, Average Remaining Contractual Term Years 5 years 10 months 6 days  
Outstanding, Aggregate Intrinsic Value $ 6,277  
Outstanding, Aggregate Intrinsic Value 4,046 $ 6,277
Exercisable, Aggregate Intrinsic Value $ 4,153