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Stock Compensation Plans (SSAR Activity) (Details) - Stock Appreciation Rights (SARs) [Member]
6 Months Ended
Jun. 30, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding [Roll Forward]  
SSARs Outstanding, Beginning of Period, shares 1,319,911
SSARs granted, shares 296,200
SSARs exercised, shares (89,400)
SSARs canceled or forfeited, shares (10,675)
SSARs Outstanding, End of Period, shares 1,516,036