Unaudited Selected Quarterly Results of Operations (Tables)

12 Months Ended

Dec. 31, 2012

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, 2012 and 2011 (in thousands, except per share data).

	Quarter ended 2012
	December 31		September 30		June 30		March 31
Services and product sales revenue	$	254,455	$	245,428	$	247,006	$	234,191
Cost of services and product sales	160,958		155,341		156,380		149,140
Other operating expenses	17,629		14,707		18,500		11,145
Operating income	75,868		75,380		72,126		73,906
Interest expense and loss on exchange of Notes	2,292		2,160		2,178		2,190
Income before income tax expense	73,576		73,220		69,948		71,716
Income tax expense	18,394		18,671		16,997		17,786
Net income	55,182		54,549		52,951		53,930
Net income (loss) attributable to non-controlling interest	381		146		35		(21		)
Net income attributable to Core Laboratories N.V.	$	54,801	$	54,403	$	52,916	$	53,951
Per share information:
Basic earnings per share	$	1.18	$	1.15	$	1.11	$	1.13
Diluted earnings per share (1)	$	1.17	$	1.14	$	1.11	$	1.13
Weighted average common shares outstanding:
Basic	46,541		47,232		47,473		47,606
Diluted	46,857		47,528		47,791		47,945

	Quarter ended 2011
	December 31		September 30		June 30			March 31
Services and product sales revenue	$	243,786	$	231,344	$	225,785		$	206,733
Cost of services and product sales	154,034		150,312		152,273			136,750
Other operating expenses	16,864		17,468		15,709			13,484
Operating income	72,888		63,564		57,803			56,499
Interest expense	2,358		3,856		2,709			2,989
Income before income tax expense	70,530		59,708		55,094			53,510
Income tax expense	17,371		14,599		14,710			7,518
Net income	53,159		45,109		40,384			45,992
Net income attributable to non-controlling interest	83		242		(67		)	(298		)
Net income attributable to Core Laboratories N.V.	$	53,076	$	44,867	$	40,451		$	46,290
Per share information:
Basic earnings per share	$	1.12	$	0.96	$	0.88		$	1.02
Diluted earnings per share (1)	$	1.11	$	0.93	$	0.83		$	0.94
Weighted average common shares outstanding:
Basic	47,343		46,606		45,945			45,225
Diluted	47,677		48,030		48,662			49,141

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