Certain Balance Sheet Components Certain Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2015

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net [Table Text Block]

Accounts receivable, net	March 31, 2015		December 31, 2014
	(in thousands)
Trade receivables (net of allowance of $5,939 and $6,195)	$	284,218	$	312,302
Unbilled receivables	40,488		36,087
Total accounts receivable, net	$	324,706	$	348,389

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

Allowance for doubtful accounts activity	Three Months Ended March 31,
	2015			2014
	(in thousands)
Beginning balance	$	6,195		$	8,368
Provision for doubtful accounts, net	269			606
Accounts written-off	(16		)	(232		)
Effect of change in exchange rates	(509		)	16
Ending balance	$	5,939		$	8,758

Inventories [Table Text Block]

Inventories	March 31, 2015		December 31, 2014
	(in thousands)
Materials	$	95,277	$	90,557
Work in process	9,374		8,991
Finished goods	63,510		54,956
Total inventories	$	168,161	$	154,504

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

Property, plant, and equipment, net	March 31, 2015			December 31, 2014
	(in thousands)
Machinery and equipment	$	276,903		$	287,448
Computers and software	98,403			100,212
Buildings, furniture, and improvements	129,321			134,461
Land	20,793			21,186
Construction in progress, including purchased equipment	22,691			21,007
Total cost	548,111			564,314
Accumulated depreciation	(355,330		)	(356,525		)
Property, plant, and equipment, net	$	192,781		$	207,789

Depreciation Expense [Table Text Block]

Depreciation expense	Three Months Ended March 31,
	2015		2014
	(in thousands)
Depreciation expense	$	11,366	$	14,522