Retirement Plans and Other Post Retirement Benefits - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Other Post Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions for next fiscal year		$ 94
Defined benefit plan, contributions by employer	$ 55
Defined benefit plan, benefits paid	55
Nonqualified Plan [Member] | Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions for next fiscal year		$ 156
Defined benefit plan, contributions by employer	78
Defined benefit plan, benefits paid	$ 1,300