Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Total long-term debt	$ 145,000		$ 100,000
Total debt	145,000		100,000
Senior credit facility
Debt Instrument [Line Items]
Total long-term debt	$ 135,000		100,000
Weighted average interest rate	3.75%	3.75%
Letters of credit issued	$ 29,700		31,000
Subordinated debt
Debt Instrument [Line Items]
Total long-term debt	$ 10,000		$ 0