Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

	Quarter Ended
(in thousands, except per share amounts)	March 31		June 30		Sept. 30		Dec. 31
2018
Revenues	$	1,014,372	$	922,295	$	925,126	$	966,756
Gross profit	199,720		154,544		166,054		161,591
Operating income	64,703		33,581		48,133		32,619
Net income	49,991		24,560		36,207		24,655
Basic net income per share	1.20		0.59		0.86		0.59
Diluted net income per share	1.18		0.58		0.86		0.59
2017
Revenues	$	882,664	$	795,552	$	795,513	$	826,494
Gross profit	159,346		130,553		139,966		142,866
Operating income	53,492		22,938		29,799		23,712
Net income	35,628		14,018		19,202		15,554
Basic net income per share(1)	0.85		0.34		0.46		0.36
Diluted net income per share(1)	0.85		0.33		0.46		0.36

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⁽¹⁾  Adjusted to reflect the two-for-one split of our common stock effected on December 18, 2017 as a stock dividend.