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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Business Combinations [Abstract] |  |  |  |
Revenues | $ 2,506,231 | $ 2,996,243 | $ 5,273,181 | $ 5,964,481
Gross profit | 355,264 | 351,820 | 688,666 | 748,918
Selling, general and administrative expenses | 227,852 | 235,433 | 458,954 | 479,288
Amortization of intangible assets | 17,779 | 18,798 | 35,845 | 37,858
Net income | 74,795 | 36,875 | 116,799 | 166,291
Net income attributable to common stock | $ 73,946 | $ 35,760 | $ 113,133 | $ 164,629
Earnings per share: |  |  |  |
Basic (in dollars per share) | $ 0.53 | $ 0.24 | $ 0.80 | $ 1.13
Diluted (in dollars per share) | $ 0.52 | $ 0.24 | $ 0.78 | $ 1.12

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