Summary of Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Data [Abstract]

Schedule of Quarterly Data

A summary of quarterly data⁽¹⁾ follows (in thousands, except per share data):

	For the Three Months Ended
	March 31,		June 30,		September 30,		December 31,
2018
Revenue	$	537,656	$	580,752	$	545,448	$	549,386
Gross profit	303,099		332,439		305,643		300,361
Operating income	113,044		145,594		117,350		115,347
Net income attributable to IDEXX Laboratories, Inc. stockholders	89,451		108,691		93,251		85,638
Earnings per share:
Basic	$	1.02	$	1.25	$	1.07	$	0.99
Diluted	$	1.01	$	1.23	$	1.05	$	0.98
2017
Revenue	$	462,021	$	508,940	$	491,976	$	506,121
Gross profit	258,191		292,715		274,002		272,474
Operating income	92,243		122,564		100,413		97,808
Net income attributable to IDEXX Laboratories, Inc. stockholders	69,019		85,357		70,511		38,257
Earnings per share:
Basic	$	0.78	$	0.97	$	0.81	$	0.44
Diluted	$	0.77	$	0.95	$	0.79	$	0.43

(1) Amounts presented may not recalculate to full-year totals due to rounding.