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Goodwill and intangible assets - Schedule of goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | $ 3,798,884 | $ 3,798,884
Accumulated impairment losses | (1,327,425) | (1,327,425)
Goodwill, net, beginning balance | 2,471,459 | 2,471,459
Goodwill recognized during the period |  | 12,548
Currency translation during the period |  | (36,961)
Goodwill, gross, ending balance |  | 3,774,471
Accumulated impairment losses |  | (1,327,425)
Goodwill, net, ending balance |  | 2,447,046
Global Ceramic segment |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | 1,567,872 | 1,567,872
Accumulated impairment losses | (531,930) | (531,930)
Goodwill, net, beginning balance | 1,035,942 | 1,035,942
Goodwill recognized during the period |  | 0
Currency translation during the period |  | (11,342)
Goodwill, gross, ending balance |  | 1,556,530
Accumulated impairment losses |  | (531,930)
Goodwill, net, ending balance |  | 1,024,600
Flooring NA segment |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | 869,764 | 869,764
Accumulated impairment losses | (343,054) | (343,054)
Goodwill, net, beginning balance | 526,710 | 526,710
Goodwill recognized during the period |  | 0
Currency translation during the period |  | 0
Goodwill, gross, ending balance |  | 869,764
Accumulated impairment losses |  | (343,054)
Goodwill, net, ending balance |  | 526,710
Flooring ROW segment |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | 1,361,248 | 1,361,248
Accumulated impairment losses | (452,441) | (452,441)
Goodwill, net, beginning balance | 908,807 | 908,807
Goodwill recognized during the period | $ 12,548 | 12,548
Currency translation during the period |  | (25,619)
Goodwill, gross, ending balance |  | 1,348,177
Accumulated impairment losses |  | (452,441)
Goodwill, net, ending balance |  | $ 895,736

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