Certain Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2019

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

Accounts receivable, net
In thousands	September 30, 2019		December 31, 2018
Trade receivables (net of allowance of $3,786 and $6,331)	$	410,391	$	416,503
Unbilled receivables	58,086		20,658
Total accounts receivable, net	$	468,477	$	437,161

Allowance for Credit Losses on Financing Receivables

Allowance for doubtful accounts activity	Three Months Ended September 30,						Nine Months Ended September 30,
In thousands	2019			2018			2019			2018
Beginning balance	$	4,360		$	4,552		$	6,331		$	3,957
Provision for (release of) doubtful accounts, net	(1		)	(105		)	(1,739		)	1,149
Accounts written-off	(468		)	(624		)	(740		)	(1,129		)
Effect of change in exchange rates	(105		)	(1		)	(66		)	(155		)
Ending balance	$	3,786		$	3,822		$	3,786		$	3,822

Inventories

Inventories
In thousands	September 30, 2019		December 31, 2018
Raw materials	$	123,964	$	133,398
Work in process	10,980		9,744
Finished goods	96,137		77,532
Total inventories	$	231,081	$	220,674

Property, Plant, and Equipment, Net

Property, plant, and equipment, net
In thousands	September 30, 2019			December 31, 2018
Machinery and equipment	$	316,787		$	315,974
Computers and software	107,907			104,290
Buildings, furniture, and improvements	148,870			146,071
Land	14,763			14,980
Construction in progress, including purchased equipment	51,306			49,682
Total cost	639,633			630,997
Accumulated depreciation	(413,975		)	(404,446		)
Property, plant, and equipment, net	$	225,658		$	226,551

Depreciation Expense

Depreciation expense	Three Months Ended September 30,				Nine Months Ended September 30,
In thousands	2019		2018		2019		2018
Depreciation expense	$	12,528	$	12,489	$	37,506	$	38,729