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Acquisitions - fair values determination of assets acquired and liabilities assumed in acquisition (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 1,276,720 | $ 1,295,852 | $ 1,323,553
Business Combinations 2016 |  |  |
Business Acquisition [Line Items] |  |  |
Current assets | 2,544 |  |
Property, plant and equipment | 662 |  |
Goodwill | 3,689 |  |
Total assets acquired | 13,968 |  |
Current liabilities | 589 |  |
Liabilities assumed | 589 |  |
Net assets acquired | 13,379 |  |
Business Combinations 2016 | Customer relationships |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets | 6,465 |  |
Business Combinations 2016 | Noncompete agreements |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets | $ 608 |  |

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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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