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Goodwill and intangible assets (Finite-Lived and Indefinite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | $ (102,283) | $ (77,244) |
Intangible Assets Total, Gross carrying amount | 397,635 | 334,663 |
Intangible Assets Total, Net amortizable intangibles | 295,352 | 257,419 |
Amortization period (in years) | 14 years |  |
Impairment of intangible assets | 0 | 1,161 | 0
Trademark [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 5,230 | 5,230 |
Customer relationships [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 283,171 | 241,358 |
Accumulated amortization | (67,435) | (49,766) |
Net amortizable intangibles | 215,736 | 191,592 |
Patents and technology [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 33,843 | 19,780 |
Accumulated amortization | (6,510) | (4,360) |
Net amortizable intangibles | 27,333 | 15,420 |
Non-compete agreements [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 6,577 | 5,880 |
Accumulated amortization | (5,108) | (4,420) |
Net amortizable intangibles | 1,469 | 1,460 |
Trade names [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 46,654 | 40,255 |
Accumulated amortization | (11,948) | (8,680) |
Net amortizable intangibles | 34,706 | 31,575 |
Distributor relationships [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 22,160 | 22,160 |
Accumulated amortization | (11,282) | (10,018) |
Net amortizable intangibles | $ 10,878 | $ 12,142 |
Minimum [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 3 years |  |
Minimum [Member] | Customer relationships [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 4 years | 4 years |
Minimum [Member] | Patents and technology [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 5 years | 5 years |
Minimum [Member] | Non-compete agreements [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 3 years | 3 years |
Minimum [Member] | Trade names [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 10 years | 10 years |
Minimum [Member] | Distributor relationships [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 8 years | 8 years |
Maximum [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 17 years |  |
Maximum [Member] | Customer relationships [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 15 years | 15 years |
Maximum [Member] | Patents and technology [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 17 years | 17 years |
Maximum [Member] | Non-compete agreements [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 6 years | 6 years |
Maximum [Member] | Trade names [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 15 years | 15 years |
Maximum [Member] | Distributor relationships [Member] |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Amortization period (in years) | 15 years | 15 years |

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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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before 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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after 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=26713463&loc=d3e16323-109275 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + 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 (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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