Select balance sheet data (Tables)

6 Months Ended

Jun. 30, 2021

Select Balance Sheet Data [Abstract]

Schedule of Inventories

Inventories as of June 30, 2021 and December 31, 2020 consist of:

	June 30, 2021		December 31, 2020
Finished goods and purchased parts	$	29,205	$	24,561
Raw materials		14,884		11,266
Work-in-process		6,850		5,539
Total	$	50,939	$	41,366

Schedule of Property, Plant and Equipment

Property, plant and equipment as of June 30, 2021 and December 31, 2020 consist of:

	Useful Lives Years*	June 30, 2021		December 31, 2020
Land	Indefinite	$	1,033	$	1,033
Land improvements	15-39		3,169		3,169
Building and building improvements	15-39		55,556		55,172
Machinery, equipment and tooling	3-10		208,170		199,854
Vehicles	5		3,841		3,778
Office furniture and fixtures	3-7		17,126		16,242
Construction in progress	N/A		11,717		3,931
Total property, plant and equipment, gross			300,612		283,179
Less accumulated depreciation			185,917		176,491
Total property, plant and equipment, net		$	114,695	$	106,688

Schedule of Changes In Goodwill

Changes in goodwill between December 31, 2020 and June 30, 2021 consist of:

Balance as of December 31, 2020	$	71,535
Impairment		—
Balance as of June 30, 2021	$	71,535

Schedule of Listing of Intangible Assets

The following is a listing of intangible assets, the useful lives in years (amortization period) and accumulated amortization as of June 30, 2021 and December 31, 2020:

	Useful Lives Years	June 30, 2021			December 31, 2020
Amortizable intangible assets:
Customer relationships and contracts	9-12	$	78,340		$	78,340
Trade name	10		14,780			14,780
Non-compete agreements	5		8,800			8,800
Patents	19		24			24
Accumulated amortization			(49,641	)		(44,288	)
Total amortizable intangible assets, net			52,303			57,656
Non-amortizable brand name			3,811			3,811
Total intangible assets, net		$	56,114		$	61,467

Schedule of Changes In Intangible Assets

Changes in intangible assets between December 31, 2020 and June 30, 2021 consist of:

Balance as of December 31, 2020	$	61,467
Amortization expense		(5,353	)
Balance as of June 30, 2021	$	56,114

Schedule of Future Amortization Expense

Future amortization expense is expected to be as followed:

Year ending December 31,
2021 (remainder)	$	5,353
2022	$	6,952
2023	$	6,866
2024	$	5,192
2025	$	5,192
Thereafter	$	22,748