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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