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Stock Incentive Plan (SSAR Activity) (Details) - Stock Appreciation Rights (SARs)
12 Months Ended
Jan. 23, 2018
shares
Dec. 31, 2018
$ / shares
shares
Share Activity    
SSARs outstanding, beginning of period (in shares) | shares   1,060,192
SSARs granted (in shares) | shares 243,600 157,700
SSARs exercised (in shares) | shares   (109,950)
SSARs canceled or forfeited (in shares) | shares   (8,350)
SSARs outstanding, end of period (in shares) | shares   1,099,592
Weighted average SSAR exercise prices per share, Granted (in dollars per share)   $ 73.14
Weighted average SSAR exercise prices per share, Exercised (in dollars per share)   51.01
Weighted average SSAR exercise prices per share, Canceled or forfeited (in dollars per share)   53.68
Weighted average SSAR exercise prices per share Outstanding at December 31 (in dollars per share)   $ 55.58
Minimum    
Share Activity    
SSAR price ranges per share, Granted (in dollars per share)   73.14
SSAR price ranges per share, Exercised (in dollars per share)   43.39
SSAR price ranges per share, Canceled (in dollars per share)   43.88
Maximum    
Share Activity    
SSAR price ranges per share, Granted (in dollars per share)   73.14
SSAR price ranges per share, Exercised (in dollars per share)   63.47
SSAR price ranges per share, Canceled (in dollars per share)   63.47