Segments (Reconciliation of adjusted EBITDA to consolidated financial statements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Income before income taxes	$ 156,914		$ 81,827		$ 45,146
Interest expense	24,035		25,036		30,131
Interest income	(758)		0		0
Depreciation and amortization	65,388		69,217		68,680
Merger and integration costs	3,998		15,336		15,340
Non-cash stock compensation expense	11,315		6,769		7,252
Impairment of assets	0		435		11,928
Inventory step-up charges	0		0		2,884
Loss on debt extinguishment	0		0		12,529
Sale of Coleman Floor	656	[1]	0		0
Acquisition costs	1,829	[2]	424	[2]	0
Other items	2,502	[3]	959	[3]	0
Other reconciling items [Member] | Other reconciling items [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization	2,007		2,408		2,088
Adjusted EBITDA	74,585		50,058		50,726
Operating segments [Member] | Geographic divisions [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Depreciation and amortization	63,381		66,809		66,592
Adjusted EBITDA	$ (340,464)		$ (250,061)		$ (244,616)

[1] For the year ended December 31, 2018, the amount represents the loss on sale of Coleman Floor as well as other expenses incurred related to the disposition.

[2] For the years ended December 31, 2018 and 2017, the amounts represent expenses incurred related to the acquisitions of Barefoot and Company (“Barefoot”), Locust Lumber, Shone Lumber, TexPly and Code Plus. For the year ended December 31, 2018, the amount also includes costs incurred related to the conversion of the enterprise resource planning system utilized by Shone Lumber.

[3] For the year ended December 31, 2018, the amount 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, the amount 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.