Certain Balance Sheet Components Certain Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2014

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net [Table Text Block]

Accounts receivable, net	March 31, 2014		December 31, 2013
	(in thousands)
Trade receivables (net of allowance of $8,758 and $8,368)	$	310,927	$	328,240
Unbilled receivables	30,620		28,469
Total accounts receivable, net	$	341,547	$	356,709

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

Allowance for doubtful account activity	Three Months Ended March 31,
	2014			2013
	(in thousands)
Beginning balance	$	8,368		$	7,372
Provision (release) of doubtful accounts, net	606			(904		)
Accounts written-off	(232		)	(105		)
Effect of change in exchange rates	16			(219		)
Ending balance	$	8,758		$	6,144

Inventories [Table Text Block]

Inventories	March 31, 2014		December 31, 2013
	(in thousands)
Materials	$	110,861	$	102,596
Work in process	10,958		13,770
Finished goods	70,754		61,101
Total inventories	$	192,573	$	177,467

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

Property, plant, and equipment, net	March 31, 2014			December 31, 2013
	(in thousands)
Machinery and equipment	$	311,578		$	309,525
Computers and software	101,002			99,654
Buildings, furniture, and improvements	146,214			145,926
Land	24,039			24,005
Construction in progress, including purchased equipment	13,393			14,257
Total cost	596,226			593,367
Accumulated depreciation	(358,900		)	(346,547		)
Property, plant, and equipment, net	$	237,326		$	246,820

Depreciation Expense [Table Text Block]

Depreciation expense	Three Months Ended March 31,
	2014		2013
	(in thousands)
Depreciation expense	$	14,522	$	14,013