Post-Retirement Plan (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
Post-Retirement Plan [Abstract] | |||
Matching contribution, percentage | 50.00% | 50.00% | 50.00% |
Employer contribution, percet of employee's gross pay | 6.00% | 6.00% | 6.00% |
Contribution, amount | $ 2.5 | $ 1.9 | $ 1.9 |