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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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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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