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Business Combinations (Narrative) (Details) - USD ($) shares in Millions |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 21, 2019 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 855,453,000 | $ 855,453,000 | $ 790,972,000
MidSouth [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net assets acquired | $ 130,500,000 | 130,480,000 |  |
Goodwill | $ 63,400,000 | 63,369,000 |  |
Shares issued | 5.0 |  |  |
Business combination transaction value on an average of share price | $ 193,800,000 |  |  |
Goodwill, Measurement period adjustments |  | $ 0 | $ (5,838,000) |

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