Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, plant and equipment

Summary of property, plant and equipment

	December 31,
	2019		2018
Land	$	2,378	$	2,378
Land improvements	4,541		4,357
Leasehold improvements		4,087		4,079
Buildings	28,715		28,238
Machinery and equipment	55,238		50,129
Furniture and fixtures	17,918		16,360
Mobile equipment and other	5,285		4,883
Construction-in-process	6,555		3,084
Total property, plant and equipment	124,717		113,508
Less accumulated depreciation	(66,273)		(58,313)
Net property, plant and equipment	$	58,444	$	55,195