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Retirement and Security Bonus Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Retirement Benefits [Abstract] |  |
401k Employer matching contributions | $ 2,900 | $ 3,200
Defined defined contribution retirement investment plans contributions | 200 | 400
Employer contributions, profit sharing retirement plan | 200 |
Retirement and Security Bonus Plans |  |
Cash surrender value in life insurance of certain employees | 6,900 |
Total liability | 133,882 | 96,428
Current liabilities | $ 97,995 | 56,930
Security bonus plan |  |
Retirement and Security Bonus Plans |  |
Initial vesting percentage | 25.00% |
Minimum vesting period | five |
Annual vesting percentage after initial period | 5.00% |
Expense recognized | $ 300 | $ 500
Total liability | 11,500 |
Current liabilities | 300 |
Long-term liabilities | $ 11,300 |

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