Certain Balance Sheet Components Certain Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2015

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net [Table Text Block]

Accounts receivable, net	December 31, 2015		December 31, 2014
	(in thousands)
Trade receivables (net of allowance of $5,949and $6,195)	$	298,550	$	321,309
Unbilled receivables	32,345		25,238
Total accounts receivable, net	$	330,895	$	346,547

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

Allowance for doubtful account activity	Year Ended December 31,
	2015			2014
	(in thousands)
Beginning balance	$	6,195		$	8,643
Provision for doubtful accounts, net	1,025			(31		)
Accounts written-off	(549		)	(1,883		)
Effects of change in exchange rates	(722		)	(534		)
Ending balance	$	5,949		$	6,195

Inventories [Table Text Block]

Inventories	December 31, 2015		December 31, 2014
	(in thousands)
Materials	$	111,191	$	90,557
Work in process	9,400		8,991
Finished goods	69,874		54,673
Total inventories	$	190,465	$	154,221

Property, Plant, and Equipment [Table Text Block]

Property, plant, and equipment, net	December 31, 2015			December 31, 2014
	(in thousands)
Machinery and equipment	$	289,015		$	287,448
Computers and software	104,310			100,212
Buildings, furniture, and improvements	127,531			134,461
Land	19,882			21,759
Construction in progress, including purchased equipment	32,639			20,583
Total cost	573,377			564,463
Accumulated depreciation	(383,121		)	(357,311		)
Property, plant, and equipment, net	$	190,256		$	207,152

Depreciation Expense [Table Text Block]

Depreciation expense	Year Ended December 31,
	2015		2014		2013
	(in thousands)
Depreciation expense	$	44,320	$	54,435	$	57,227