Unaudited Selected Quarterly Results of Operations (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015 and 2014 (in thousands, except per share data):

	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 (loss) 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

	Quarter ended 2014
	December 31		September 30		June 30		March 31
Services and product sales revenue	$	278,622	$	276,135	$	267,562	$	262,903
Cost of services and product sales	168,517		166,927		168,158		161,669
Other operating expenses	19,655		20,088		15,270		18,407
Operating income	90,450		89,120		84,134		82,827
Interest expense	2,882		2,561		2,794		2,363
Income before income tax expense	87,568		86,559		81,340		80,464
Income tax expense	20,841		19,909		17,244		19,311
Net income	66,727		66,650		64,096		61,153
Net income attributable to non-controlling interest	537		153		362		89
Net income attributable to Core Laboratories N.V.	$	66,190	$	66,497	$	63,734	$	61,064
Per share information:
Basic earnings per share (1)	$	1.51	$	1.51	$	1.43	$	1.36
Diluted earnings per share (1)	$	1.51	$	1.50	$	1.42	$	1.35
Weighted average common shares outstanding:
Basic	43,742		44,152		44,660		44,908
Diluted	43,927		44,381		44,910		45,182

(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.