Goodwill and Intangible Assets (Goodwill Rollforward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Beginning balance	$ 262,997	$ 261,792
Ending balance	297,146	262,997
2019 Acquisitions [Member]
Goodwill [Line Items]
Goodwill acquired during period	34,832
Ending balance	34,800
WE Shone Co [Member]
Goodwill [Line Items]
Goodwill acquired during period		2,526
Coleman Floor [Member]
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit		$ (1,321)
Arkansas Market [Member]
Goodwill [Line Items]
Exit from Arkansas market	$ (683)