Goodwill and Intangible Assets, Net Goodwill and Intangible Assets (Intangible Rollforward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]
Net Finite-lived Intangible Assets, beginning of period	$ 158,888	$ 167,612	$ 167,215
Amortization	(18,045)	(15,015)	(16,003)
Net Finite-lived Intangible Assets, end of period	185,629	158,888	167,612
Trademarks [Member]
Finite-lived Intangible Assets [Roll Forward]
Gross Carrying Amount, beginning of period	4,350	5,350	5,350
Accumulated Amortization, beginning of period	(4,350)	(4,558)	(2,548)
Amortization		(83)	(2,010)
Gross Carrying Amount, end of period	4,350	4,350	5,350
Accumulated Amortization, end of period	(4,350)	(4,350)	(4,558)
Customer relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Gross Carrying Amount, beginning of period	202,600	195,600	179,700
Accumulated Amortization, beginning of period	(44,037)	(29,294)	(15,509)
Amortization	(17,830)	(14,743)	(13,785)
Gross Carrying Amount, end of period	246,842	202,600	195,600
Accumulated Amortization, end of period	(61,793)	(44,037)	(29,294)
Non-compete Agreements [Member]
Finite-lived Intangible Assets [Roll Forward]
Gross Carrying Amount, beginning of period	7,012	7,012	6,512
Accumulated Amortization, beginning of period	(6,687)	(6,498)	(6,290)
Amortization	(215)	(189)	(208)
Gross Carrying Amount, end of period	7,482	7,012	7,012
Accumulated Amortization, end of period	(6,902)	(6,687)	(6,498)
Code Plus [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions			2,800
Code Plus [Member] | Customer relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions			2,300
Code Plus [Member] | Non-compete Agreements [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions			500
TexPly [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions			13,600
TexPly [Member] | Customer relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions			$ 13,600
WE Shone Co [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions		7,000
WE Shone Co [Member] | Customer relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions		7,000
Coleman Floor [Member]
Finite-lived Intangible Assets [Roll Forward]
Disposition of Coleman Floor, net		(709)
Coleman Floor [Member] | Trademarks [Member]
Finite-lived Intangible Assets [Roll Forward]
Disposition of Coleman Floor, gross		(1,000)
Disposition of Coleman Floor, accumulated amortization		$ 291
2019 Acquisitions [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions	45,020
2019 Acquisitions [Member] | Customer relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions	44,550
2019 Acquisitions [Member] | Non-compete Agreements [Member]
Finite-lived Intangible Assets [Roll Forward]
Acquisitions	470
Arkansas Market [Member] | Customer relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Exit from Arkansas Market, gross	(308)
Exit from Arkansas Market, accumulated amortization	74
Exit from Arkansas Market, net	$ (234)