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Business Combinations (Details) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 717,863,000 | $ 714,963,000 | $ 708,664,000 | $ 681,358,000
2021 Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gross Aggregate Consideration | 13,800,000 |  |  |
Cash Assumed | 100,000 |  |  |
Business Combination, Consideration Transferred | 13,700,000 |  |  |
Current Assets | 700,000 |  |  |
Property, Plant, and Equipment | 13,000,000.0 |  |  |
Goodwill | 2,900,000 |  |  |
Other Intangibles | 600,000 |  |  |
Current Liabilities | 200,000 |  |  |
Deferred Credits and Other Liabilities | 100,000 |  |  |
Deferred Tax Liabilities | $ 3,200,000 |  |  |

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