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Employee Benefit Plans - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2019 shares | Dec. 31, 2019 USD ($) plan employee shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares | May 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cost recognized | $ |  | $ 1,603,000 | $ 1,488,000 | $ 1,299,000 |  |
Number of retired union participants still receiving benefits |  | 166 |  |  |  |
Number of retired union participants eligible for benefits | employee |  | 23 |  |  |  |
Age of eligibility to receive benefits |  | 62 years |  |  |  |
Minimum years of service to obtain eligibility for benefits |  | 5 years |  |  |  |
Non-union retirees still receiving benefits, age of coverage |  | 65 years |  |  |  |
Common Stock, authorized (in shares) |  | 40,000,000 | 40,000,000 |  |  |
Treasury Stock (in shares) |  | 1,087,840 | 1,259,551 |  |  |
Number of active plans | plan |  | 2 |  |  |  |
Share-based compensation expense | $ |  | $ 2,424,000 | $ 2,612,000 | $ 2,245,000 |  |
Grants in period (in shares) |  | 83,683 |  |  |  |
Stock shares repurchased (in shares) |  | 77,481 | 27,214 | 74,132 |  |
Stock shares repurchased | $ |  | $ 5,489,000 | $ 2,324,000 | $ 4,663,000 |  |
EDC plan investments | $ |  | 1,185,000 | 0 |  |  |
EDC plan liabilities | $ |  | $ 1,337,000 | $ 1,176,000 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
RSUs vested in period (in shares) |  | 235,409 | 80,343 | 203,000 |  |
Grants in period (in shares) |  | 45,993 | 42,136 | 47,514 |  |
Number of nonvested shares (in shares) |  | 116,855 | 329,205 | 368,492 | 527,486 |
Options, vested in period, fair value | $ |  | $ 2,951,000 | $ 1,239,000 | $ 979,000 |  |
Unrecognized compensation costs, other than options | $ |  | $ 2,745,000 |  |  |  |
Period for recognition of unrecognized compensation cost |  | 2 years 2 months 12 days |  |  |  |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock authorized but not granted (in shares) |  |  |  |  |  | 300,000
Short-term Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Targeted bonus award expense | $ |  | $ 461,000 | 5,581,000 | 5,150,000 |  |
Short-term Incentive Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense | $ |  | $ 123,000 | 821,000 | $ 491,000 |  |
Award vesting period |  | 48 months |  |  |  |
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Award vesting period, tranche one |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 12 months |  |  |  |
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Remaining award vesting period |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 36 months |  |  |  |
The 2014 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock authorized but not granted (in shares) |  | 1,500,000 |  |  |  |
The 2014 Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |
Grants in period (in shares) |  | 344,190 |  |  |  |
The Director's Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock authorized but not granted (in shares) |  | 300,000 |  |  |  |
The 2004 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 5 years |  |  |  |
RSUs vested in period (in shares) | 145,000 |  |  |  |  |
Restricted stock authorized but not granted (in shares) |  | 2,680,000 |  |  |  |
Weighted average remaining contractual term |  | 10 years |  |  |  |
The 2004 Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grant (in shares) |  | 0 |  |  |  |
Authorized shares remaining for issuance (in shares) |  | 0 |  |  |  |
The 2004 Plan | Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options outstanding (in shares) |  | 0 |  |  |  |
The 2004 Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of nonvested shares (in shares) |  | 0 |  |  |  |
Number of shares available for grant (in shares) |  | 0 |  |  |  |
Post-employment benefits |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Liability, defined benefit plan, current | $ |  | $ 441,000 | 467,000 |  |  |
Liability, defined benefit plan, noncurrent | $ |  | $ 2,509,000 | $ 2,595,000 |  |  |

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