Receivables and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Receivables [Line Items]
Interest paid on installment agreements	$ 5,600	$ 6,100
Gross receivables		128,558	$ 98,050
Receivables, net of allowance for doubtful accounts of $7,763 and $8,047 in 2021 and 2020, respectively		120,795	90,003
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts		7,763	8,047
Bad debt expense		6,058
Accounts written off, net of recoveries		(6,342)
Installment sales receivable [Member]
Receivables [Line Items]
Gross receivables		62,309	61,794
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts		6,900	7,000
Trade and notes receivables [Member]
Receivables [Line Items]
Gross receivables		66,249	36,256
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts		$ 900	$ 1,000