CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Sales	[1]	$ 28,673,363	$ 28,916,847	$ 29,676,768
Cost of sales		25,482,233	25,618,466	25,975,856
Gross profit		3,191,130	3,298,381	3,700,912
Operating expenses:
Selling, general, and administrative expenses		2,087,050	2,191,612	2,303,051
Depreciation and amortization		189,058	189,790	186,384
Loss on disposition of businesses, net (Note 2)		0	21,252	3,604
Impairments (Notes 2 and 3)		7,223	698,246	0
Restructuring, integration, and other charges		13,288	89,785	60,361
Total operating expenses		2,296,619	3,190,685	2,553,400
Operating income		894,511	107,696	1,147,512
Equity in (losses) of affiliated companies		(531)	(2,765)	(2,332)
Gain (loss) on investments, net		5,348	11,831	(14,166)
Employee benefit plan expense, net		(2,859)	(24,849)	(6,870)
Interest and other financing expense, net		(137,210)	(203,743)	(214,771)
Income (loss) before income taxes		759,259	(111,830)	909,373
Provision for income taxes		172,795	88,338	187,799
Consolidated net income (loss)		586,464	(200,168)	721,574
Noncontrolling interests		2,026	3,919	5,379
Net income (loss) attributable to shareholders		$ 584,438	$ (204,087)	$ 716,195
Net income (loss) per share:
Basic		$ 7.49	$ (2.44)	$ 8.19
Diluted	[2]	$ 7.43	$ (2.44)	$ 8.10
Weighted-average shares outstanding:
Basic		77,992	83,568	87,476
Diluted		78,635	83,568	88,444

[1] Includes sales related to the United States of $10,162,989, $11,511,611, and $12,157,306 for 2020, 2019, and 2018, respectively.

[2] Stock-based compensation awards for the issuance of 1,143 shares, 1,614 shares, and 651 shares for the years ended December 31, 2020, 2019, and 2018, respectively, were excluded from the computation of net income (loss) per share on a diluted basis as their effect was anti-dilutive. As the company reported a net loss attributable to shareholders for 2019, basic and diluted net loss per share attributable to shareholders are the same.