Investments - Summary of Proceeds from Sales of Deferred Compensation Plan Investments and Realized Gains and Losses Recognized (Details) - Deferred Compensation Plan Investments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Proceeds and realized gains and losses recognized
Sale Proceeds	$ 1,915	$ 899	$ 3,805	$ 1,990
Realized Gains	$ 218	17	307	37
Realized (Losses)		$ (96)	$ (28)	$ (142)