Certain Balance Sheet Components (Text Block)

3 Months Ended

Mar. 31, 2017

Balance Sheet Related Disclosures [Abstract]

Certain Balance Sheet Components [Text Block]

Certain Balance Sheet Components

Accounts receivable, net	March 31, 2017		December 31, 2016
	(in thousands)
Trade receivables (net of allowance of $3,424 and $3,320)	$	307,065	$	299,870
Unbilled receivables	37,346		51,636
Total accounts receivable, net	$	344,411	$	351,506

Allowance for doubtful accounts activity	Three Months Ended March 31,
	2017			2016
	(in thousands)
Beginning balance	$	3,320		$	5,949
Provision (release) for doubtful accounts, net	303			(8		)
Accounts written-off	(330		)	(1,478		)
Effect of change in exchange rates	131			78
Ending balance	$	3,424		$	4,541

Inventories	March 31, 2017		December 31, 2016
	(in thousands)
Materials	$	111,832	$	103,274
Work in process	10,573		7,925
Finished goods	55,655		51,850
Total inventories	$	178,060	$	163,049

Property, plant, and equipment, net	March 31, 2017			December 31, 2016
	(in thousands)
Machinery and equipment	$	287,378		$	279,746
Computers and software	101,648			98,125
Buildings, furniture, and improvements	125,383			122,680
Land	17,604			17,179
Construction in progress, including purchased equipment	29,612			29,358
Total cost	561,625			547,088
Accumulated depreciation	(382,978		)	(370,630		)
Property, plant, and equipment, net	$	178,647		$	176,458

Depreciation expense	Three Months Ended March 31,
	2017		2016
	(in thousands)
Depreciation expense	$	9,829	$	10,464