Receivables and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Receivables [Line Items]
Interest paid on installment agreements	$ 8,500
Accounts Receivable, before Allowance for Credit Loss	83,387	$ 89,724
Receivables, net of allowance for doubtful accounts of $7,916 and $5,601 in 2020 and 2019, respectively	75,471	84,123
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	7,916	5,601
Bad debt expense	10,959
Accounts written off	(9,141)
Recoveries	497
Installment sales receivable [Member]
Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss	57,939	56,370
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	7,000	4,100
Trade and notes receivables [Member]
Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss	25,448	33,354
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	$ 900	$ 1,500