Receivables and Allowance for Doubtful Accounts Receivables and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Receivables [Line Items]
Interest paid on installment agreements	$ 2,800
Accounts Receivable, before Allowance for Credit Loss	80,169	$ 89,724
Receivables, net of allowance for doubtful accounts of $7,066 and $5,601 in 2020 and 2019, respectively	73,103	84,123
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	7,066	5,601
Bad debt expense	3,749
Accounts written off	(2,441)
Recoveries	157
Installment sales receivable [Member]
Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss	54,545	56,370
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	5,500	4,100
Trade and notes receivables [Member]
Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss	25,624	33,354
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	$ 1,600	$ 1,500