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Stock-based Compensation (Schedule of SARs Oustanding) (Details) - SARs [Member]
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
SARs  
Balance at December 31, 2014 | shares 353,955
Exercised | shares (45,428)
Forfeited | shares (1,204)
Balance at December 31, 2015 | shares 307,323
Exercisable at December 31, 2015 | shares 254,816
Weighted Average Exercise Price  
Balance at December 31, 2014 | $ / shares $ 35.52
Exercised | $ / shares 27.92
Forfeited | $ / shares 53.96
Balance at December 31, 2015 | $ / shares 36.57
Exercisable at December 31, 2015 | $ / shares $ 33.56