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Stock-Based Compensation Plans (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 [Abstract] |  |  |  |
Stock-based compensation expense |  | $ 6,917 | $ 7,998 | $ 7,638
Restricted Shares [Member] | Employees [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Estimated forfeitures |  | 5.00% |  |
Restricted Shares [Member] | Executives [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Estimated forfeitures |  | 0.00% |  |
Restricted Shares [Member] | Directors [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Estimated forfeitures |  | 0.00% |  |
Restricted Shares [Member] | Age 60 [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Vesting percentage |  | 25.00% |  |
Restricted Shares [Member] | Age 63 [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Vesting percentage |  | 25.00% |  |
Restricted Shares [Member] | Age 65 [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Vesting percentage |  | 100.00% |  |
Performance-Based Shares [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Measuring period for performance-based shares |  | 3 years |  |
Restricted and performance-based stock, shares [Roll Forward] |  |  |  |
Forfeited (in shares) |  | (20,508) | (2,085) |
Restricted and Performance-Based Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Abstract] |  |  |  |
Stock-based compensation expense |  | $ 6,500 | $ 7,400 | 7,100
Stock-based compensation expense, net of tax |  | 4,900 | 5,500 | $ 3,200
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Unamortized compensation expense |  | $ 15,900 | $ 15,800 |
Restricted and performance-based stock, shares [Roll Forward] |  |  |  |
Beginning of period (in shares) |  | 870,041 | 853,958 |
Granted (in shares) |  | 204,650 | 198,004 |
Vested (in shares) |  | (188,693) | (167,811) |
Forfeited (in shares) | [1] | (33,458) | (14,110) |
End of period (in shares) |  | 852,540 | 870,041 | 853,958
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward] |  |  |  |
Beginning of period (in dollars per share) |  | $ 34.59 | $ 33.25 |
Granted (in dollars per share) |  | 42.05 | 39.36 |
Vested (in dollars per share) |  | 38.08 | 39.90 |
Forfeited (in dollars per share) |  | 43.32 | 42.28 |
End of period (in dollars per share) |  | $ 35.26 | $ 34.59 | $ 33.25
Weighted-average grant date fair value |  | $ 30,100 | $ 30,100 | $ 28,400
Restricted and Performance-Based Shares [Member] | Employees [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Weighted average period of recognition for unrecognized compensation expense |  | 4 years 7 months 6 days | 4 years 3 months 18 days |
Restricted and Performance-Based Shares [Member] | Directors [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Weighted average period of recognition for unrecognized compensation expense |  | 3 months 18 days | 3 months 18 days |
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Minimum [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Holding period for restricted and performance shares issued |  | 1 year |  |
Post vesting holding period for restricted and performance shares issued |  | 1 year |  |
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Maximum [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Holding period for restricted and performance shares issued |  | 2 years |  |
Post vesting holding period for restricted and performance shares issued |  | 2 years |  |
2016 Omnibus Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Abstract] |  |  |  |
Shares authorized for issuance (in shares) |  | 1,100,000 |  |
2016 Omnibus Incentive Plan [Member] | Restricted Shares [Member] |  |  |  |
Restricted and performance-based stock, shares [Roll Forward] |  |  |  |
Granted (in shares) |  | 148,400 |  |
2016 Omnibus Incentive Plan [Member] | Performance-Based Shares [Member] |  |  |  |
Restricted and performance-based stock, shares [Roll Forward] |  |  |  |
Granted (in shares) |  | 56,250 |  |
2016 Omnibus Incentive Plan [Member] | Restricted and Performance-Based Shares [Member] |  |  |  |
Restricted Stock and Performance Share Grants [Abstract] |  |  |  |
Restricted and performance-based stock grants issued, net of forfeitures (in shares) |  | 778,071 |  |
Common stock available for future grants (in shares) |  | 321,929 |  |
[1] | Due to the lack of achievement of performance targets, performance-based shares forfeited in the years ended December 31, 2019 and 2018 were 20,508 shares and 2,085 shares, respectively.

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