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Stock Compensation Plans (SSAR Activity) (Details) (Stock Appreciation Rights (SARs) [Member], USD $)
3 Months Ended
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding [Roll Forward]  
SSARs Outstanding, Beginning of Period 1,094,836
SSARs granted, shares 297,900
SSARs exercised, shares (5,575)
SSARs canceled or forfeited, shares (20,181)
SSARs Outstanding, End of Period 1,366,980
SSAR price ranges per share:  
Granted $ 55.23
Weighted average SSAR exercise prices per share:  
Granted $ 55.23
Exercised $ 35.06
Canceled or forfeited $ 52.51
Outstanding $ 48.24
Minimum [Member]
 
SSAR price ranges per share:  
Exercised $ 21.45
Canceled or forfeited $ 21.45
Maximum [Member]
 
SSAR price ranges per share:  
Exercised $ 52.94
Canceled or forfeited $ 56.98