Certain Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

Accounts receivable, net
In thousands	December 31, 2019		December 31, 2018
Trade receivables (net of allowance of $3,064 and $6,331)	$	415,887	$	416,503
Unbilled receivables	57,038		20,658
Total accounts receivable, net	$	472,925	$	437,161

Allowance for Credit Losses on Financing Receivables

Allowance for doubtful account activity	Year Ended December 31,
In thousands	2019		2018		2017
Beginning balance	$	6,331	$	3,957	$	3,320
Provision for (release of) doubtful accounts, net	(1,511)		3,874		1,656
Accounts written-off	(1,749)		(1,281)		(1,351)
Effect of change in exchange rates	(7)		(219)		332
Ending balance	$	3,064	$	6,331	$	3,957

Inventories

Inventories
In thousands	December 31, 2019		December 31, 2018
Raw materials	$	120,861	$	133,398
Work in process	11,105		9,744
Finished goods	95,930		77,532
Total inventories	$	227,896	$	220,674

Property, Plant, and Equipment

Property, plant, and equipment, net
In thousands	December 31, 2019		December 31, 2018
Machinery and equipment	$	323,003	$	315,974
Computers and software	109,924		104,290
Buildings, furniture, and improvements	149,471		146,071
Land	14,988		14,980
Construction in progress, including purchased equipment	54,490		49,682
Total cost	651,876		630,997
Accumulated depreciation	(418,648)		(404,446)
Property, plant, and equipment, net	$	233,228	$	226,551

Depreciation Expense

Depreciation expense	Year Ended December 31,
In thousands	2019		2018		2017
Depreciation expense	$	50,114	$	50,784	$	42,430