Certain Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

Accounts receivable, net
In thousands	December 31, 2021		December 31, 2020
Trade receivables (net of allowance of $5,730 and $1,312)	$	261,124	$	318,269
Unbilled receivables	37,335		51,559
Total accounts receivable, net	$	298,459	$	369,828

Allowance for Credit Losses on Financing Receivables

Allowance for credit losses account activity	Year Ended December 31,
In thousands	2021		2020		2019
Beginning balance	$	1,312	$	3,064	$	6,331
Provision for (release of) doubtful accounts, net	4,636		(299)		(1,511)
Accounts written-off	(107)		(1,463)		(1,749)
Effect of change in exchange rates	(111)		10		(7)
Ending balance	$	5,730	$	1,312	$	3,064

Inventories

Inventories
In thousands	December 31, 2021		December 31, 2020
Raw materials	$	122,434	$	114,058
Work in process	7,856		8,094
Finished goods	35,509		60,225
Total inventories	$	165,799	$	182,377

Property, Plant, and Equipment

Property, plant, and equipment, net
In thousands	December 31, 2021		December 31, 2020
Machinery and equipment	$	314,502	$	334,050
Computers and software	111,540		115,776
Buildings, furniture, and improvements	131,764		155,676
Land	8,952		14,303
Construction in progress, including purchased equipment	39,527		31,425
Total cost	606,285		651,230
Accumulated depreciation	(443,101)		(443,414)
Property, plant, and equipment, net	$	163,184	$	207,816

Depreciation Expense

Depreciation expense	Year Ended December 31,
In thousands	2021		2020		2019
Depreciation expense	$	48,352	$	52,579	$	50,114