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Goodwill and intangible assets (Finite-Lived and Indefinite-Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Accumulated amortization $ (154,059) $ (147,892)
Intangible Assets Total, Gross carrying amount 395,026 394,542
Intangible Assets Total, Net amortizable intangibles 240,967 246,650
Trademark    
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 280,381 280,297
Accumulated amortization (106,206) (101,636)
Net amortizable intangibles 174,175 178,661
Patents and technology    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 34,359 34,140
Accumulated amortization (10,739) (10,264)
Net amortizable intangibles 23,620 23,876
Non-compete agreements    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 7,295 7,269
Accumulated amortization (6,431) (6,292)
Net amortizable intangibles 864 977
Trade names    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 45,601 45,446
Accumulated amortization (16,557) (15,890)
Net amortizable intangibles 29,044 29,556
Distributor relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Gross carrying amount 22,160 22,160
Accumulated amortization (14,126) (13,810)
Net amortizable intangibles $ 8,034 $ 8,350
Minimum | Customer relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 4 years 4 years
Minimum | Patents and technology    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 5 years 5 years
Minimum | Non-compete agreements    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 3 years 3 years
Minimum | Trade names    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 10 years 10 years
Minimum | Distributor relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 8 years 8 years
Maximum | Customer relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 15 years 15 years
Maximum | Patents and technology    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 17 years 17 years
Maximum | Non-compete agreements    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 6 years 6 years
Maximum | Trade names    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 15 years 15 years
Maximum | Distributor relationships    
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Amortization period 15 years 15 years