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Acquisitions Of Businesses (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2019 USD ($) Company | Oct. 31, 2019 Company | Sep. 16, 2019 Company | Aug. 01, 2019 Company | May 10, 2019 Company | Apr. 01, 2019 Company | Jan. 04, 2019 Company | Nov. 01, 2018 Company | Oct. 02, 2018 Company | May 03, 2018 Company | Apr. 04, 2018 Company | Nov. 01, 2017 Company | Mar. 01, 2017 Company | Jan. 04, 2017 Company | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,063,911 | $ 990,887 | $ 964,893
Amortization periods |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years 6 months |  |
Number of businesses acquired | Company | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |  |  |
BKI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage acquired | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 220,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital acquired | 29,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other net assets | 4,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 43,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 141,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years 6 months |  |
2019 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,300 |  |
Working capital acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,300 |  |
Other net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,100 |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,600 |  |
2018 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71,600 |
Working capital acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,700 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,300 |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36,600 |
2017 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 111,900
Working capital acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,300
Other net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,700
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 56,600

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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