Employee Benefit Plans (Additional Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020
401(k)/Profit Sharing Plan
Contribution match, as a percentage of annual pay	4.00%
Contribution matches, percentage of pre-tax compensation	3.00%	3.00%	3.00%
Expenses under the 401(K)/Profit Sharing plan	$ 2,400	$ 2,300	$ 2,300
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum guaranteed benefit term	15 years
Accumulated benefit obligation	$ 14,200	$ 12,100
Other Postretirement Benefits Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for future years	4.50%	5.00%	5.00%
Other Postretirement Benefits Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for future years	7.00%	6.00%	6.00%
Scenario, Forecast | Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected amortization of net actuarial loss				$ 623
Scenario, Forecast | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected amortization of net actuarial loss				78,000
Expected amortization of prior service cost				$ 24