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Pro Forma Effect of Businesses Acquired (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition
Revenue	$ 12,506,109	$ 11,876,674	$ 9,736,909
Income from continuing operations	543,415	487,565	536,974
Less: net income (loss) attributable to continuing noncontrolling interest	$ 2,800	$ 3,050	$ (3,516)
Basic earnings per share from continuing operations	$ 1.75	$ 1.55	$ 1.74
Diluted earnings per share from continuing operations (1)	$ 1.75	$ 1.54	$ 1.73
Stahlgruber [Member]
Business Acquisition
Revenue		$ 1,100,000
All 2018 Acquisitions excluding Stahlgruber [Member]
Business Acquisition
Revenue		46,000
All Completed Acquisitions [Member]
Business Acquisition
Acquisition Related Costs, Net of Tax	$ 1,499	14,524	$ 8,787
Pro Forma [Member]
Business Acquisition
Revenue	12,530,723	12,856,212	11,942,523
Income from continuing operations	563,059	525,989	567,224
Income (Loss) from Continuing Operations, Net of Tax, Excluding Portion Attributable to Noncontrolling Interest	560,259	520,140	569,645
Pro Forma [Member] | Stahlgruber [Member]
Business Acquisition
Revenue	0	815,405	1,756,893
Income from continuing operations	14,481	17,309	4,796
Pro Forma [Member] | All 2019 Acquisitions excluding Stahlgruber Czech Republic Wholesale Business [Member]
Business Acquisition
Revenue	24,614
Income from continuing operations	3,664
Business Acquisition Pro Forma Net Income attributable to noncontrolling interest	$ 0
Pro Forma [Member] | All 2019 and 2018 acquisitions excluding Stahlgruber and Stahlgruber Czech Republic Wholesale Business [Member]
Business Acquisition
Revenue		164,133
Income from continuing operations		6,591
Business Acquisition Pro Forma Net Income attributable to noncontrolling interest		$ 2,799
Pro Forma [Member] | All 2018 and 2017 acquisitions excluding Stahlgruber [Member]
Business Acquisition
Revenue			448,721
Income from continuing operations			16,667
Business Acquisition Pro Forma Net Income attributable to noncontrolling interest			$ 1,095

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