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Basis of Presentation Payments to Acquire Businesses, Net of Cash Acquired (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Business Acquisitions [Abstract] |  |
Payments for business acquisitions | $ (163,724) | $ 0

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- Definition Business Acquisitions [Abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration