Business segment information (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Schedule of Net Sales by Reporting Segment

The table below present net sales, which includes product sales and marketing service fees, by reporting segment:

	Three Months Ended March 31,
(U.S. Dollars, in thousands)	2017		2016		Change
BioStim	$	44,539	$	41,044		8.5	%
Biologics		14,987		14,094		6.3	%
Extremity Fixation		23,945		24,709		-3.1	%
Spine Fixation		19,267		18,832		2.3	%
Net sales	$	102,738	$	98,679		4.1	%

Summary of Net Margin by Reporting Segment

The table below presents net margin by reporting segment:

	Three Months Ended March 31,
(U.S. Dollars, in thousands)	2017			2016
BioStim	$	17,133		$	16,408
Biologics		6,171			6,104
Extremity Fixation		6,412			7,175
Spine Fixation		2,007			2,335
Corporate		(98	)		(302	)
Net margin	$	31,625		$	31,720
General and administrative		18,282			17,005
Research and development		7,424			7,640
Operating income	$	5,919		$	7,075