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Goodwill and intangible assets (Finite-Lived and Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 14 years |
Accumulated amortization | $ (166,218) | $ (147,892)
Intangible Assets Total, Gross carrying amount | 382,636 | 394,542
Intangible Assets Total, Net amortizable intangibles | 216,418 | 246,650
Trademarks |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 5,230 | 5,230
Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 270,586 | 280,297
Accumulated amortization | (115,381) | (101,636)
Net amortizable intangibles | 155,205 | 178,661
Patents and technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 33,936 | 34,140
Accumulated amortization | (12,225) | (10,264)
Net amortizable intangibles | 21,711 | 23,876
Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 6,230 | 7,269
Accumulated amortization | (5,594) | (6,292)
Net amortizable intangibles | 636 | 977
Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 44,494 | 45,446
Accumulated amortization | (17,944) | (15,890)
Net amortizable intangibles | 26,550 | 29,556
Distributor relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 22,160 | 22,160
Accumulated amortization | (15,074) | (13,810)
Net amortizable intangibles | $ 7,086 | $ 8,350
Maximum |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 17 years |
Maximum | Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 15 years | 15 years
Maximum | Patents and technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 17 years | 17 years
Maximum | Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 6 years | 6 years
Maximum | Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 15 years | 15 years
Maximum | Distributor relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 15 years | 15 years
Minimum |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 3 years |
Minimum | Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 4 years | 4 years
Minimum | Patents and technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 5 years | 5 years
Minimum | Non-compete agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 3 years | 3 years
Minimum | Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 10 years | 10 years
Minimum | Distributor relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Estimated useful life, intangible assets | 8 years | 8 years

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- Definition Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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