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Business Combinations (Details) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 708,664,000 | $ 679,395,000 | $ 681,358,000 | $ 664,922,000
Measurement period adjustments | (3,613,000) | $ 0 | $ (6,669,000) |
2020 Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Gross Aggregate Consideration | 77,400,000 |  |  |
Cash Assumed | 1,700,000 |  |  |
Business Combination, Consideration Transferred | 70,700,000 |  |  |
Business Combination indemnity holdback liability | 5,000,000.0 |  |  |
Current Assets | 46,100,000 |  |  |
Property, Plant, and Equipment | 4,900,000 |  |  |
Goodwill | 27,300,000 |  |  |
Other Intangibles | 20,600,000 |  |  |
Current Liabilities | 21,200,000 |  |  |
Deferred Credits and Other Liabilities | 300,000 |  |  |
Measurement period adjustments | $ (3,600,000) |  |  |

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