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Goodwill and Other Intangible Assets (2018 Acquisitions) (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combinations [Line Items] |  |  |
Cash, net of cash acquired | $ 24,971 | $ 179,481 | $ 6,684
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high | 179,000 |  |
2018 Acquisitions [Member] |  |  |
Business Combinations [Line Items] |  |  |
Cash, net of cash acquired | 5,100 |  |
Business combinations, contingent consideration, earn-out liabilities | 1,500 |  |
Business combinations, contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high | $ 4,000 |  |

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