Stock Compensation Plans (SSAR Activity) (Details) - Stock Appreciation Rights (SARs) [Member]	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SSARs granted, dollars per share	43.88
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	(56,300)
SSARs canceled or forfeited, shares | shares	(92,544)
SSARs Outstanding, End of Period, shares | shares	1,397,180
Weighted average SSAR exercise prices per share:
Granted, dollars per share	$ 43.88
Exercised, dollars per share	27.27
Canceled or forfeited, dollars per share	56.43
Outstanding, dollars per share	$ 49.33
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SSARs exercised, dollars per share	52.94
SSARs canceled, dollars per share	56.98
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SSARs exercised, dollars per share	21.45
SSARs canceled, dollars per share	43.88