Receivables and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Receivables [Line Items]
Interest paid on installment agreements	$ 5,600
Accounts Receivable, before Allowance for Credit Loss	85,221	$ 89,724
Receivables, net of allowance for doubtful accounts of $8,238 and $5,601 in 2020 and 2019, respectively	76,983	84,123
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	8,238	5,601
Bad debt expense	7,900
Accounts written off	(5,620)
Recoveries	357
Installment sales receivable [Member]
Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss	56,687	56,370
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	6,800	4,100
Trade and notes receivables [Member]
Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss	28,534	33,354
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	$ 1,400	$ 1,500