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Retirement and Security Bonus Plans Retirement and Security Bonus Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |
401k Employer matching contributions | $ 3.0 | $ 3.1
Defined Contribution Retirement Plan Discretionary Employer Contribution | 0.3 | 0.3
Employer contributions, profit sharing retirement plan | 0.7 | 0.7
Retirement and Security Bonus Plans |  |
Cash Surrender Value, Fair Value Disclosure | $ 5.6 |
Security bonus plan |  |
Retirement and Security Bonus Plans |  |
Initial vesting percentage | 25.00% |
Minimum vesting period | 5 years |
Annual vesting percentage after initial period | 5.00% |
Expense recognized | $ 0.6 | $ 0.5

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