Receivables and Allowance for Doubtful Accounts Receivables and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss	$ 76,743	$ 74,528
Receivables, net of allowance for doubtful accounts of $5,981 and $4,883 in 2019 and 2018, respectively	70,762	69,645
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	5,981	4,883
Bad debt expense	10,198
Estimated returns and uncollectible rental payments	1,393
Accounts written off	(10,913)
Recoveries	420
Installment sales receivable [Member]
Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss	52,163	54,746
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	3,200	3,600
Trade and notes receivables [Member]
Receivables [Line Items]
Accounts Receivable, before Allowance for Credit Loss	24,580	19,782
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts	$ 2,800	$ 1,300