Receivables and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Receivables [Line Items]
Interest paid on installment agreements	$ 3,100	$ 2,800
Gross receivables	123,326		$ 98,050
Receivables, net of allowance for doubtful accounts of $7,981 and $8,047 in 2021 and 2020, respectively	115,345		90,003
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	7,981		8,047
Bad debt expense	3,449
Accounts written off, net of recoveries	(3,515)
Installment sales receivable [Member]
Receivables [Line Items]
Gross receivables	60,798		61,794
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	7,000		7,000
Trade and notes receivables [Member]
Receivables [Line Items]
Gross receivables	62,528		36,256
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	$ 1,000		$ 1,000