Receivables and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Receivables [Line Items]
Interest paid on installment agreements	$ 8,500	$ 9,200
Gross receivables		139,894	$ 98,050
Total receivables, net of allowance for doubtful accounts		131,930	90,003
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts		7,964	8,047
Bad debt expense		9,825
Accounts written off, net of recoveries		(9,908)
Installment sales receivable [Member]
Receivables [Line Items]
Gross receivables		63,064	61,794
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts		7,100	7,000
Trade and notes receivables [Member]
Receivables [Line Items]
Gross receivables		76,830	36,256
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts		$ 900	$ 1,000