CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales		$ 26,812,508	$ 23,825,261	$ 23,282,020
Cost of sales		23,455,169	20,681,062	20,246,770
Gross Profit		3,357,339	3,144,199	3,035,250
Operating expenses:
Selling, general, and administrative expenses		2,162,996	2,052,863	1,986,249
Depreciation and amortization		153,599	159,195	155,754
Impairment of assets held for sale		21,000	0	0
Restructuring, integration, and other charges		91,294	73,602	68,765
Total Operating Expenses		2,428,889	2,285,660	2,210,768
Operating income		928,450	858,539	824,482
Equity in earnings of affiliated companies		3,424	7,573	7,037
Loss on investment, net		14,231	0	992
Loss on extinguishment of debt		59,545	0	2,943
Interest and other financing expense, net		163,810	150,715	135,401
Income before income taxes		694,288	715,397	692,183
Provision for income taxes		287,126	190,674	191,697
Consolidated net income		407,162	524,723	500,486
Noncontrolling interests		5,200	1,973	2,760
Net income attributable to shareholders		$ 401,962	$ 522,750	$ 497,726
Net income per share:
Basic		$ 4.53	$ 5.75	$ 5.26
Diluted	[1]	$ 4.48	$ 5.68	$ 5.20
Weighted-average shares outstanding:
Basic		88,681	90,960	94,608
Diluted		89,766	92,033	95,686

[1] Stock-based compensation awards for the issuance of 380 shares, 766 shares, and 658 shares for the years ended December 31, 2017, 2016, and 2015, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.