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Acquisitions and Dispositions of Businesses (Pro Forma Financials) (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Document Fiscal Year Focus |  |  | 2019 |
Pro Forma Operating Revenues | $ 737,602 | $ 748,958 | $ 1,442,995 | $ 1,477,590
Pro Forma Net Income | $ 57,195 | $ 46,694 | $ 139,321 | $ 91,796

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