Certain Balance Sheet Components (Text Block)

6 Months Ended

Jun. 30, 2017

Balance Sheet Related Disclosures [Abstract]

Certain Balance Sheet Components [Text Block]

Certain Balance Sheet Components

Accounts receivable, net	June 30, 2017		December 31, 2016
	(in thousands)
Trade receivables (net of allowance of $3,502 and $3,320)	$	345,738	$	299,870
Unbilled receivables	28,442		51,636
Total accounts receivable, net	$	374,180	$	351,506

Allowance for doubtful accounts activity	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
	(in thousands)
Beginning balance	$	3,424		$	4,541		$	3,320		$	5,949
Provision (release) for doubtful accounts, net	441			(80		)	744			(88		)
Accounts written-off	(475		)	(364		)	(805		)	(1,842		)
Effect of change in exchange rates	112			(158		)	243			(80		)
Ending balance	$	3,502		$	3,939		$	3,502		$	3,939

Inventories	June 30, 2017		December 31, 2016
	(in thousands)
Materials	$	124,363	$	103,274
Work in process	14,399		7,925
Finished goods	64,872		51,850
Total inventories	$	203,634	$	163,049

Property, plant, and equipment, net	June 30, 2017			December 31, 2016
	(in thousands)
Machinery and equipment	$	297,314		$	279,746
Computers and software	105,570			98,125
Buildings, furniture, and improvements	130,165			122,680
Land	18,161			17,179
Construction in progress, including purchased equipment	32,036			29,358
Total cost	583,246			547,088
Accumulated depreciation	(396,740		)	(370,630		)
Property, plant, and equipment, net	$	186,506		$	176,458

Depreciation expense	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(in thousands)
Depreciation expense	$	10,120	$	11,011	$	19,949	$	21,475