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Retirement and Long-Term Incentive Plans - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employer discretionary contribution | $ 700,000 | $ 800,000 |
Available shares for future issuance (in shares) | 1,611,928 |  |
Share-based compensation cost charged against income | $ 1,126,000 | $ 1,774,000 | $ 2,795,000
Total unrecognized compensation costs | $ 1,900,000 |  |
Recognition of compensation cost, weighted average period | 1 year 10 months 24 days |  |
Value of awards granted | $ 1,800,000 |  |
Total fair value of shares vested | $ 400,000 |  |
Outstanding stock option awards | 0 |  |
Stock option awards granted | 0 | 0 | 0
Performance based share compensation expense |  | $ 0 |
Non-employee directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock vesting period | 6 months |  |
Employee Stock Option | Long Term Incentive Plan 1997 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized (in shares) | 1,000,000 |  |
Employee Stock Option | Long Term Incentive Plan 2002 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized (in shares) | 500,000 |  |
Employee Stock Option | Long Term Incentive Plan 2011 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized (in shares) | 500,000 |  |
Employee Stock Option | Long Term Incentive Plan 2015 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized (in shares) | 2,500,000 |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock vesting period | 3 years |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period awards are earned | 3 years |  |
Performance based share compensation benefit due to reversal of previously recognized expense |  | $ 1,700,000 |
Performance based share compensation expense | $ 0 |  | $ 1,100,000
Cash-Based Performance Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance based share compensation expense | $ 0 |  |
Performance period awards are earned | 3 years |  |
Target amounts payable associated with performance period | $ 500,000 |  |

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