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Stock Compensation Plans (SSAR Activity) (Details) - 6 months ended Jun. 30, 2015 - Stock Appreciation Rights (SARs) [Member]
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding [Roll Forward]  
SSARs Outstanding, Beginning of Period, shares | shares 1,220,824
SSARs granted, shares | shares 325,200
SSARs exercised, shares | shares (36,750)
SSARs canceled or forfeited, shares | shares (83,400)
SSARs Outstanding, End of Period, shares | shares 1,425,874
SSAR price ranges per share:  
Granted, dollars per share 43.88
Canceled or forfeited, dollars per share 56.98
Weighted average SSAR exercise prices per share:  
Granted, dollars per share $ 43.88
Exercised, dollars per share 25.02
Canceled or forfeited, dollars per share 56.98
ShareBasedCompensationSharesAuthorizedUnderStockSettledStockAppreciationRightsPlanWeightedAverageExercisePricePerShareOutstanding $ 49.10
Minimum [Member]  
SSAR price ranges per share:  
Exercised, dollars per share 21.45
Maximum [Member]  
SSAR price ranges per share:  
Exercised, dollars per share 33.65