Letters of Credit	12 Months Ended
	Dec. 31, 2020
Financial Instruments Pledged as Collateral [Abstract]
Letters of Credit	Letters of CreditAs of December 31, 2020, the Company had a $30.0 million standby letter of credit secured by restricted cash, of which $23.6 million had been drawn upon for issued letters of credit. As of December 31, 2019, the Company had a $35.0 million unsecured standby letter of credit facility, of which $23.3 million had been drawn upon for issued letters of credit.