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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Combinations [Abstract] |  |  |  |
Revenues | $ 2,848,012 | $ 2,698,755 | $ 5,667,910 | $ 5,162,994
Gross profit | 320,092 | 344,753 | 685,452 | 659,007
Selling, general and administrative expenses | 225,287 | 211,288 | 458,981 | 432,934
Amortization of intangible assets | 12,610 | 12,828 | 25,478 | 25,810
Net income | 27,951 | 76,951 | 148,471 | 118,142
Net income attributable to common stock | $ 26,836 | $ 76,610 | $ 146,809 | $ 116,804
Earnings per share: |  |  |  |
Basic (in dollars per share) | $ 0.18 | $ 0.50 | $ 1.01 | $ 0.75
Diluted (in dollars per share) | $ 0.18 | $ 0.49 | $ 1.00 | $ 0.75

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