Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

A summary of the company's consolidated quarterly results of operations is as follows:



	First Quarter		Second Quarter (b)		Third Quarter		Fourth Quarter (c)
2017
Sales	$	5,759,552	$	6,465,346	$	6,953,740	$	7,633,870
Gross profit		759,887		823,966		843,358		930,128
Operating income		191,722		229,822		235,992		270,914
Net income attributable to shareholders		113,768		99,679		134,630		53,885

Net income per share (a):
Basic	$	1.27	$	1.12	$	1.52	$	0.61
Diluted	$	1.26	$	1.11	$	1.50	$	0.60

2016
Sales	$	5,474,177	$	5,972,101	$	5,936,092	$	6,442,891
Gross profit		748,898		798,791		773,162		823,348
Operating income		181,364		223,592		198,684		254,899
Net income attributable to shareholders		106,235		134,270		117,727		164,518

Net income per share (a):
Basic	$	1.16	$	1.46	$	1.29	$	1.84
Diluted	$	1.14	$	1.45	$	1.28	$	1.81


(a)	Quarterly net income per share is calculated using the weighted-average shares outstanding during each quarterly period, while net income per share for the full year is calculated using the weighted-average shares outstanding during the year. Therefore, the sum of the net income per share for each of the four quarters may not equal the net income per share for the full year.


(b)	Net income attributable to shareholders includes a loss on extinguishment of debt of $58.8 million during the second quarter of 2017


(c)	Net income attributable to shareholders includes a U.S. Tax Act expense of $124.7 million during the fourth quarter of 2017.