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Acquisitions Of Businesses (Details) $ in Thousands | Mar. 01, 2017 USD ($) Company | Jan. 04, 2017 Company | Apr. 15, 2016 USD ($) Company | Apr. 01, 2016 Company | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,010,399 | $ 979,628
Number of businesses acquired | Company | 1 | 1 | 1 | 1 |  |
Q1 2017 Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 84,800 |  |  |  |  |
Working capital acquired | 9,600 |  |  |  |  |
Other net assets | 300 |  |  |  |  |
Goodwill | 28,700 |  |  |  |  |
Identifiable intangible assets | $ 46,200 |  |  |  |  |
Ardent [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  | 100.00% |  |  |
Purchase price |  |  | $ 201,400 |  |  |
Working capital acquired |  |  | 34,100 |  |  |
Other net assets |  |  | 3,900 |  |  |
Goodwill |  |  | 121,900 |  |  |
Identifiable intangible assets |  |  | 41,500 |  |  |
Acquired goodwill, tax deductible amount |  |  | $ 99,700 |  |  |
Intangible amortization period |  |  | 13 years 6 months |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + 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 (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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