Long-term Debt and Line of Credit - Provisions of Revolving Line of Credit (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Repayments of Debt	$ 11,155,000	$ 6,750,000
Proceeds from lines of credit	5,000,000	$ 5,000,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	50,000,000.0
Minimum borrowing increment amount	1,000,000.0
Increment borrowing multiple for amounts borrowed in excess of minimum borrowing amount	250,000
Amount outstanding	0
Remaining borrowing capacity	48,300,000
Repayments of Debt	10,000,000.0
Decrease in debt balance	5,000,000.0
Proceeds from lines of credit	5,000,000.0
Letter of Credit | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	20,000,000.0
Letters of credit outstanding	1,700,000
Bridge Loan | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	5,000,000.0
Minimum borrowing increment amount	250,000
Increment borrowing multiple for amounts borrowed in excess of minimum borrowing amount	$ 50,000