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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