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Goodwill and Other Intangible Assets (Q1 2021 Acquisitions) (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 10, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combinations [Line Items] |  |  |  |
Cash, net of cash acquired and other |  | $ 24,971 | $ 179,481 | $ 6,684
2021 Acquisitions [Member] | Subsequent Event [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Cash, net of cash acquired and other | $ 110,000 |  |  |

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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=121586364&loc=d3e3213-108585 + Details
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