Certain Balance Sheet Components Certain Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2015

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net [Table Text Block]

Accounts receivable, net	September 30, 2015		December 31, 2014
	(in thousands)
Trade receivables (net of allowance of $4,959 and $6,195)	$	298,895	$	312,302
Unbilled receivables	41,528		36,087
Total accounts receivable, net	$	340,423	$	348,389

Allowance for Credit Losses on Financing Receivables [Table Text Block]

Allowance for doubtful accounts activity	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
	(in thousands)
Beginning balance	$	5,422		$	7,355		$	6,195		$	8,368
Provision (release) for doubtful accounts, net	(141		)	(356		)	(111		)	(545		)
Accounts written-off	(162		)	(233		)	(503		)	(1,023		)
Effect of change in exchange rates	(160		)	(242		)	(622		)	(276		)
Ending balance	$	4,959		$	6,524		$	4,959		$	6,524

Inventories [Table Text Block]

Inventories	September 30, 2015		December 31, 2014
	(in thousands)
Materials	$	123,730	$	90,557
Work in process	10,193		8,991
Finished goods	80,314		54,956
Total inventories	$	214,237	$	154,504

Property, Plant, and Equipment, Net [Table Text Block]

Property, plant, and equipment, net	September 30, 2015			December 31, 2014
	(in thousands)
Machinery and equipment	$	278,609		$	287,448
Computers and software	107,328			100,212
Buildings, furniture, and improvements	130,009			134,461
Land	20,758			21,186
Construction in progress, including purchased equipment	24,784			21,007
Total cost	561,488			564,314
Accumulated depreciation	(371,193		)	(356,525		)
Property, plant, and equipment, net	$	190,295		$	207,789

Depreciation Expense [Table Text Block]

Depreciation expense	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
	(in thousands)
Depreciation expense	$	11,885	$	13,691	$	34,784	$	42,118