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Acquisitions and divestitures Pro Forma Summary of Results of Opeation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Business Acquisition, Pro Forma Revenue | $ 3,900,750 | $ 3,820,558 | $ 7,678,519 | $ 7,576,206
Business Acquisition, Pro Forma Net Income (Loss) | $ 128,654 | $ 58,996 | $ 579,906 | $ 160,709
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 0.67 | $ 0.29 | $ 3.02 | $ 0.79
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 0.66 | $ 0.28 | $ 2.98 | $ 0.77

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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