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Retirement and Long-Term Incentive Plans - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employer discretionary contribution | $ 800,000 |  |
Available shares for future issuance (in shares) | 611,887 |  |
Share-based compensation cost charged against income | $ 1,774,000 | $ 2,795,000 | $ 2,741,000
Total unrecognized compensation costs | 1,600,000 |  |
Total income tax (expense) benefit under share-based compensation | $ 13,000 | $ (19,000) | $ (300,000)
Recognition of compensation cost, weighted average period | 2 years |  |
Value of awards granted | $ 1,000,000 |  |
Total fair value of shares vested | $ 2,900,000 |  |
Outstanding stock option awards | 0 |  |
Stock option awards granted | 0 | 0 | 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) | 1,000,000 |  |
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 |  | $ 1,100,000 | $ 1,500,000
Amount accrued for stock-based performance award granted | 0 |  |
Payout earned for performance based shares granted | 0 |  |
Fair value of performance based shares granted |  | $ 3,800,000 | $ 4,700,000
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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