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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

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