Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property, plant and equipment

Summary of property, plant and equipment

	December 31,
	2015		2014
Land	$	1,500	$	1,500
Land improvements	3,010		2,292
Leasehold improvements		859		499
Buildings	24,476		21,918
Machinery and equipment	35,628		31,780
Furniture and fixtures	11,657		10,070
Mobile equipment and other	2,255		1,999
Construction-in-process	2,155		1,930
Total property, plant and equipment	81,540		71,988
Less accumulated depreciation	(38,904)		(34,442)
Net property, plant and equipment	$	42,636	$	37,546