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Stock-Based Compensation, Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee service share-based compensation, aggregate disclosures [Abstract]      
Share based compensation costs $ 10.2 $ 8.1 $ 6.2
Restricted Stock [Member]      
Employee service share-based compensation, aggregate disclosures [Abstract]      
Unrecognized stock-based compensation expense $ 6.4    
Weighted average period over which unrecognized stock-based compensation expense is expected to be recognized 3 years    
Share based compensation costs $ 5.6 5.2 4.4
Reversals of compensation expense related to restricted stock forfeitures $ 2.3 $ 1.9 $ 2.4
Restricted Stock [Roll Forward]      
Balance, beginning of year (in shares) 177,736 134,578 180,110
Granted (in shares) 108,212 116,901 69,361
Vested (in shares) (43,702) (40,776) (59,649)
Canceled (in shares) (40,261) (32,967) (55,244)
Balance, end of year (in shares) 201,985 177,736 134,578
Weighted Average Grant Date Fair Value [Abstract]      
Balance, beginning of year (in dollars per share) $ 62.40 $ 68.64 $ 58.57
Granted (in dollars per share) 56.93 54.51 76.26
Vested (in dollars per share) 66.07 60.79 56.44
Canceled (in dollars per share) 65.42 61.87 58.57
Balance, end of year (in dollars per share) $ 58.07 $ 62.40 $ 68.64