Subsequent Events (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2021 USD ($)	Apr. 30, 2021 executive	Mar. 31, 2021 USD ($) executive	Dec. 31, 2020 USD ($)
Subsequent Event [Line Items]
Net book value of assets			$ 21,500
Number of executives participating in SERP | executive			2
Supplemental executive retirement plan			$ 20,833	$ 20,628
Subsequent Event
Subsequent Event [Line Items]
Number of executives participating in SERP | executive		2
Supplemental executive retirement plan	$ 20,000
Subsequent Event | Scenario, Forecast
Subsequent Event [Line Items]
Sales price of corporate headquarters building	$ 24,000
Lease term	18 months
Gain on sale of building	$ 2,000
Net curtailment loss	$ 2,000