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Compensation Plans - Schedule of Various Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 4,032 $ 3,452 $ 3,427
Total unrecognized compensation cost for nonvested stock units $ 4,600    
Expected years to recognize unearned compensation 2 years    
Weighted average fair value (usd per share) $ 47,460 $ 50,190  
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 364 $ 174 0
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 1,969 1,211 898
Total fair value at vesting date 1,067 1,544 1,471
Total unrecognized compensation cost for nonvested stock units $ 3,417 $ 2,175 $ 837
Expected years to recognize unearned compensation 1 year 10 months 24 days 2 years 1 year 9 months 18 days
Stock Options and SSARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of option exercises on date of exercise $ 407 $ 2,469 $ 3,156
Stock Plan for Non-Management Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares issued 11,382,000 11,750,000 10,531,000
Weighted average fair value (usd per share) $ 41.63 $ 50.74 $ 42.46