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Pro Forma Effect of Businesses Acquired (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition |  |
Revenue, as reported | $ 3,100,303 | $ 2,720,764
Income from continuing operations | 99,063 |
Less: net income (loss) attributable to noncontrolling interest | 1,015 | (197)
Net income | 99,063 | 152,763
All Completed Acquisitions [Member] |  |
Business Acquisition |  |
Acquisition Related Costs, Net of Tax | 224 | 1,526
Pro Forma [Member] |  |
Business Acquisition |  |
Revenue, as reported | 3,106,283 | 3,253,303
Income from continuing operations | 102,691 | 155,896
Income (Loss) from Continuing Operations, Net of Tax, Excluding Portion Attributable to Noncontrolling Interest | 101,676 | 155,565
Pro Forma [Member] | Stahlgruber [Member] |  |
Business Acquisition |  |
Revenue, as reported | 0 | 489,534
Income from continuing operations | 3,074 | 1,273
Pro Forma [Member] | All 2019 Acquisitions [Member] |  |
Business Acquisition |  |
Revenue, as reported | 5,980 |
Pro Forma [Member] | All 2019 and 2018 acquisitions excluding Stahlgruber [Member] |  |
Business Acquisition |  |
Revenue, as reported |  | 43,005
Income from continuing operations | 330 | 334
Business Acquisition Pro Forma Net Income attributable to noncontrolling interest | $ 0 | $ 528

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