Certain Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

Accounts receivable, net
In thousands	March 31, 2019		December 31, 2018
Trade receivables (net of allowance of $4,046 and $6,331)	$	438,692	$	416,503
Unbilled receivables	34,385		20,658
Total accounts receivable, net	$	473,077	$	437,161

Allowance for Credit Losses on Financing Receivables

Allowance for doubtful accounts activity	Three Months Ended March 31,
In thousands	2019			2018
Beginning balance	$	6,331		$	3,957
Provision for doubtful accounts, net	(2,103		)	920
Accounts written-off	(192		)	(258		)
Effect of change in exchange rates	10			155
Ending balance	$	4,046		$	4,774

Inventories

Inventories
In thousands	March 31, 2019		December 31, 2018
Materials	$	132,050	$	133,398
Work in process	9,106		9,744
Finished goods	79,941		77,532
Total inventories	$	221,097	$	220,674

Property, Plant, and Equipment, Net

Property, plant, and equipment, net
In thousands	March 31, 2019			December 31, 2018
Machinery and equipment	$	318,695		$	315,974
Computers and software	107,703			104,290
Buildings, furniture, and improvements	147,320			146,071
Land	15,063			14,980
Construction in progress, including purchased equipment	45,237			49,682
Total cost	634,018			630,997
Accumulated depreciation	(409,080		)	(404,446		)
Property, plant, and equipment, net	$	224,938		$	226,551

Depreciation Expense

Depreciation expense	Three Months Ended March 31,
In thousands	2019		2018
Depreciation expense	$	12,384	$	13,332