Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Details)

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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