Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

	Quarter ended
	March 31		June 30		Sept. 30		Dec. 31
	(in thousands, except per share amounts)
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
2016
Revenues	$	802,408	$	707,332	$	702,538	$	729,069
Gross profit	150,016		113,259		117,796		110,539
Operating income	53,043		16,023		22,773		14,467
Net income	32,693		9,713		14,065		9,520
Basic net income per share(1)	0.77		0.23		0.33		0.23
Diluted net income per share(1)	0.77		0.23		0.33		0.23

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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.