Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Unrealized gain on available-for-sale marketable securities, net of taxes	$ 703	$ (1,271)	$ 1,656	$ (533)	$ (568)	$ 1,123
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from available for sale municipal bonds					12,031	5,779
Realized gain					200
Realized loss						(100)
Net unrealized gains related to equity securities	2,900		6,700		4,100	1,000
Municipal bonds — available-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from available for sale municipal bonds	7,000		4,000		12,000	5,800
Realized gain	$ 300				$ 200
Realized loss			$ (100)			$ (100)