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Stock Incentive Plan (SSAR Activity) (Details) - Stock Appreciation Rights (SARs)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share Activity  
SSARs outstanding, beginning of period | shares 1,220,824
SSARs granted | shares 325,200
SSARs exercised | shares (75,850)
SSARs canceled or forfeited | shares (150,263)
SSARs outstanding, end of period | shares 1,319,911
Weighted average SSAR exercise prices per share, Granted $ 43.88
Weighted average SSAR exercise prices per share, Exercised 27.01
Weighted average SSAR exercise prices per share, Canceled or forfeited 54.75
Weighted average SSAR exercise prices per share Outstanding at December 31 $ 49.56
Minimum  
Share Activity  
SSAR price ranges per share, Granted 43.88
SSAR price ranges per share, Exercised 21.45
SSAR price ranges per share, Canceled 43.88
Maximum  
Share Activity  
SSAR price ranges per share, Granted 43.88
SSAR price ranges per share, Exercised 52.94
SSAR price ranges per share, Canceled 56.98