Segments (Reconciliation of adjusted EBITDA to consolidated financial statements) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Income before income taxes		$ 146,484		$ 156,914		$ 81,827
Interest expense		23,156		24,035		25,036
Interest income		(3,988)		(758)		0
Depreciation and amortization		72,153		65,388		69,217
Merger and integration costs		6,485		3,998		15,336
Non-cash stock compensation expense		12,462		11,315		6,769
Acquisition costs		1,136		1,829		424
Business Reorganization Costs	[1]	1,767		656		435
Other items	[3]	(222)	[2]	2,502	[2]	959
Other reconciling items [Member] | Other reconciling items [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization		2,332		2,007		2,408
Adjusted EBITDA		76,445		74,585		50,058
Operating segments [Member] | Geographic divisions [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization		69,821		63,381		66,809
Adjusted EBITDA		$ (335,878)		$ (340,464)		$ (250,061)

[1] Represents asset impairment charges related to the relocation of the operations of certain of the Company’s facilities and charges related to the disposition of the Company’s Coleman Floor business and exit from the Arkansas Market.

[2] For the year ended December 31, 2018, represents costs incurred in connection with the departure of the Company’s former chief executive officer and the search for and appointment of his permanent replacement. For the year ended December 31, 2017, represents expense incurred related to pending litigation of $3.0 million and income related to the final settlement of insurance claims made by the Company for a fire at one of the Company’s facilities during 2015 of $2.0 million.

[3] For the year ended December 31, 2019, represents income from a recovery made by the Company related to a fire at one of the Company’s facilities during 2015 and the effect of the settlement of pending litigation for an amount less than what was previously accrued. See Note 14 for further details on the settlement of pending litigation. For the year ended December 31, 2018, represents costs incurred in connection with the departure of the Company’s former chief executive officer and the search for and appointment of his permanent replacement. For the year ended December 31, 2017, represents expense incurred related to pending litigation of $3.0 million and income related to the final settlement of insurance claims made by the Company for a fire at one of the Company’s facilities during 2015 of $2.0 million.