Unaudited Selected Quarterly Results of Operations (Tables)

12 Months Ended

Dec. 31, 2016

Unaudited Selected Quarterly Results of Operations [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

Summarized below is our unaudited quarterly financial data for the quarters ended December 31, 2016 and 2015 (in thousands, except per share data):

	Quarter ended 2016
	December 31			September 30		June 30			March 31
Services and product sales revenue	$	149,542		$	143,483	$	148,069		$	153,647
Cost of services and product sales	112,678			107,153		109,999			112,814
Other operating expenses	15,340			14,842		17,843			17,893
Operating income	21,524			21,488		20,227			22,940
Interest expense	2,548			2,569		3,021			3,434
Income before income tax expense	18,976			18,919		17,206			19,506
Income tax expense	3,607			2,081		671			4,389
Net income	15,369			16,838		16,535			15,117
Net income (loss) attributable to non-controlling interest	(90		)	108		(89		)	35
Net income attributable to Core Laboratories N.V.	$	15,459		$	16,730	$	16,624		$	15,082
Per share information:
Basic earnings per share (1)	$	0.35		$	0.38	$	0.38		$	0.36
Diluted earnings per share (1)	$	0.35		$	0.38	$	0.38		$	0.35
Weighted average common shares outstanding:
Basic	44,113			44,110		43,297			42,380
Diluted	44,326			44,320		43,505			42,520

	Quarter ended 2015
	December 31		September 30		June 30		March 31
Services and product sales revenue	$	182,723	$	197,265	$	203,889	$	213,643
Cost of services and product sales	124,709		129,050		134,619		144,274
Other operating expenses	34,372		21,397		21,377		26,652
Operating income	23,642		46,818		47,893		42,717
Interest expense	3,390		3,471		3,116		2,403
Income before income tax expense	20,252		43,347		44,777		40,314
Income tax expense	4,658		9,753		10,075		9,272
Net income	15,594		33,594		34,702		31,042
Net income attributable to non-controlling interest	176		190		76		(357		)
Net income attributable to Core Laboratories N.V.	$	15,418	$	33,404	$	34,626	$	31,399
Per share information:
Basic earnings per share (1)	$	0.36	$	0.79	$	0.81	$	0.72
Diluted earnings per share (1)	$	0.36	$	0.78	$	0.81	$	0.72
Weighted average common shares outstanding:
Basic	42,355		42,517		42,790		43,340
Diluted	42,518		42,685		42,959		43,466

(1) The sum of the individual quarterly earnings per share amounts may not agree with the year-to-date earnings per share amounts as each quarterly computation is based on the weighted average number of common shares outstanding during that period.