Accounts Receivable Accounts Receivable (Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1	$ 4,904	$ 4,771		$ 4,162
Write-offs	(8,588)	(4,676)		(3,665)
Recoveries	1,811	1,460		960
Increase in allowance	7,547	4,906		3,314
Other	0	(1,557)	[1]	0
Balance at December 31	5,674	4,904		4,771
Decrease in allowance	$ 7,547	4,906		$ 3,314
Other long-term assets [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Notes receivable		2,600
Allowance for notes receivable		1,300
Coleman Floor [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Increase in allowance		300
Decrease in allowance		$ 300

[1] During the year ended December 31, 2018, the Company entered into a promissory note with one of its customers resulting in a note receivable of $2.6 million and corresponding allowance of $1.3 million, included in other long-term assets. These amounts were previously included in trade receivables and allowance for doubtful accounts, respectively, within accounts receivable. Additionally, the allowance for doubtful accounts balance declined by $0.3 million during the year ended December 31, 2018 in connection with the sale of accounts receivable in the Coleman Floor disposition. See Note 3 for further details.