Property, plant and equipment (Tables)

3 Months Ended

Mar. 31, 2021

Property, plant and equipment

Summary of property, plant and equipment

	March 31,		December 31,
	2021		2020
Land	$	2,378	$	2,378
Land improvements		4,830		4,830
Leasehold improvements		4,087		4,087
Buildings		29,584		29,580
Machinery and equipment		61,459		61,154
Furniture and fixtures		20,144		19,782
Mobile equipment and other		5,208		5,200
Construction-in-process		12,863		11,751
Total property, plant and equipment		140,553		138,762
Less accumulated depreciation		(76,151)		(74,442)
Net property, plant and equipment	$	64,402	$	64,320