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Certain Balance Sheet Components Certain Balance Sheet Components (Tables)
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9 Months Ended |
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Sep. 30, 2014
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| Balance Sheet Related Disclosures [Abstract] |
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| Accounts Receivable, Net [Table Text Block] |
| | | | | | | | | Accounts receivable, net | September 30, 2014 | | December 31, 2013 | | (in thousands) | Trade receivables (net of allowance of $6,524 and $8,368) | $ | 310,261 |
| | $ | 328,240 |
| Unbilled receivables | 32,219 |
| | 28,469 |
| Total accounts receivable, net | $ | 342,480 |
| | $ | 356,709 |
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| 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, | | 2014 | | 2013 | | 2014 | | 2013 | | (in thousands) | Beginning balance | $ | 7,355 |
| | $ | 6,948 |
| | $ | 8,368 |
| | $ | 7,372 |
| Provision (release) of doubtful accounts, net | (356 | ) | | 1,290 |
| | (545 | ) | | 1,461 |
| Accounts written-off | (233 | ) | | (164 | ) | | (1,023 | ) | | (467 | ) | Effect of change in exchange rates | (242 | ) | | 153 |
| | (276 | ) | | (139 | ) | Ending balance | $ | 6,524 |
| | $ | 8,227 |
| | $ | 6,524 |
| | $ | 8,227 |
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| Inventories [Table Text Block] |
| | | | | | | | | Inventories | September 30, 2014 | | December 31, 2013 | | (in thousands) | Materials | $ | 101,607 |
| | $ | 102,596 |
| Work in process | 11,694 |
| | 13,770 |
| Finished goods | 77,388 |
| | 61,101 |
| Total inventories | $ | 190,689 |
| | $ | 177,467 |
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| Property, Plant, and Equipment, Net [Table Text Block] |
| | | | | | | | | Property, plant, and equipment, net | September 30, 2014 | | December 31, 2013 | | (in thousands) | Machinery and equipment | $ | 307,098 |
| | $ | 309,525 |
| Computers and software | 101,861 |
| | 99,654 |
| Buildings, furniture, and improvements | 139,681 |
| | 145,926 |
| Land | 22,764 |
| | 24,005 |
| Construction in progress, including purchased equipment | 16,730 |
| | 14,257 |
| Total cost | 588,134 |
| | 593,367 |
| Accumulated depreciation | (365,780 | ) | | (346,547 | ) | Property, plant, and equipment, net | $ | 222,354 |
| | $ | 246,820 |
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| Depreciation Expense [Table Text Block] |
| | | | | | | | | | | | | | | | | Depreciation expense | Three Months Ended September 30, | | Nine Months Ended September 30, | | 2014 | | 2013 | | 2014 | | 2013 | | (in thousands) | Depreciation expense | $ | 13,691 |
| | $ | 14,330 |
| | $ | 42,118 |
| | $ | 42,370 |
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