Restructuring, Acquisition, and Integration-Related Costs (Related Costs Restructuring Reserve) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Beginning balance	$ 11,426	$ 10,030
Provision	37,085	38,463	$ 33,085
Cash payments	(39,833)	(20,940)
Non-cash items	7,583	16,127
Ending balance	1,095	11,426	10,030
Lease impairments
Restructuring Reserve [Roll Forward]
Beginning balance	0	0
Cash payments	(449)	0
Non-cash items	0	0
Ending balance	359	0	0
Asset write-downs
Restructuring Reserve [Roll Forward]
Beginning balance	0	0
Cash payments	(190)	0
Non-cash items	7,309	11,027
Ending balance	0	0	0
Severance
Restructuring Reserve [Roll Forward]
Beginning balance	5,183	8,965
Cash payments	(9,469)	(10,958)
Non-cash items	230	2
Ending balance	584	5,183	8,965
Other restructuring costs
Restructuring Reserve [Roll Forward]
Beginning balance	6,243	1,065
Cash payments	(29,725)	(9,982)
Non-cash items	44	5,098
Ending balance	152	6,243	$ 1,065
Operating segments | Global Ceramic
Restructuring Reserve [Roll Forward]
Provision	1,542	2,270
Operating segments | Global Ceramic | Lease impairments
Restructuring Reserve [Roll Forward]
Provision	492	0
Operating segments | Global Ceramic | Asset write-downs
Restructuring Reserve [Roll Forward]
Provision	0	795
Operating segments | Global Ceramic | Severance
Restructuring Reserve [Roll Forward]
Provision	1,082	1,396
Operating segments | Global Ceramic | Other restructuring costs
Restructuring Reserve [Roll Forward]
Provision	(32)	79
Operating segments | Flooring NA
Restructuring Reserve [Roll Forward]
Provision	31,796	32,068
Operating segments | Flooring NA | Lease impairments
Restructuring Reserve [Roll Forward]
Provision	316	0
Operating segments | Flooring NA | Asset write-downs
Restructuring Reserve [Roll Forward]
Provision	6,849	10,048
Operating segments | Flooring NA | Severance
Restructuring Reserve [Roll Forward]
Provision	2,500	3,850
Operating segments | Flooring NA | Other restructuring costs
Restructuring Reserve [Roll Forward]
Provision	22,131	18,170
Operating segments | Flooring ROW
Restructuring Reserve [Roll Forward]
Provision	3,633	4,125
Operating segments | Flooring ROW | Lease impairments
Restructuring Reserve [Roll Forward]
Provision	0	0
Operating segments | Flooring ROW | Asset write-downs
Restructuring Reserve [Roll Forward]
Provision	650	184
Operating segments | Flooring ROW | Severance
Restructuring Reserve [Roll Forward]
Provision	1,518	1,932
Operating segments | Flooring ROW | Other restructuring costs
Restructuring Reserve [Roll Forward]
Provision	1,465	$ 2,009
Operating segments | Corporate
Restructuring Reserve [Roll Forward]
Provision	114
Operating segments | Corporate | Lease impairments
Restructuring Reserve [Roll Forward]
Provision	0
Operating segments | Corporate | Asset write-downs
Restructuring Reserve [Roll Forward]
Provision	0
Operating segments | Corporate | Severance
Restructuring Reserve [Roll Forward]
Provision	0
Operating segments | Corporate | Other restructuring costs
Restructuring Reserve [Roll Forward]
Provision	$ 114