Certain Balance Sheet Components Certain Balance Sheet Components (Tables)
| 9 Months Ended |
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Sep. 30, 2011 |
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| Balance Sheet Related Disclosures [Abstract] | |
| Accounts Receivable, Net [Table Text Block] | | | | | | | | | | Accounts receivable, net | September 30, 2011 | | December 31, 2010 | | (in thousands) | Trade receivables (net of allowance of $7,452 and $9,045) | $ | 340,641 |
| | $ | 328,811 |
| Unbilled receivables | 36,466 |
| | 42,851 |
| Total accounts receivable, net | $ | 377,107 |
| | $ | 371,662 |
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| Summary of Allowance for Doubtful Accounts [Table Text Block] | | | | | | | | | | | | | | | | | | Allowance for doubtful account activity | Three Months Ended September 30, | | Nine Months Ended September 30, | | 2011 | | 2010 | | 2011 | | 2010 | | (in thousands) | Beginning balance | $ | 8,980 |
| | $ | 6,298 |
| | $ | 9,045 |
| | $ | 6,339 |
| Provision (release) of doubtful accounts, net | 175 |
| | (904 | ) | | 128 |
| | (242 | ) | Accounts written-off | (1,127 | ) | | (21 | ) | | (1,680 | ) | | (194 | ) | Effects of change in exchange rates | (576 | ) | | 393 |
| | (41 | ) | | (137 | ) | Ending balance | $ | 7,452 |
| | $ | 5,766 |
| | $ | 7,452 |
| | $ | 5,766 |
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| Inventories [Table Text Block] | | | | | | | | | | Inventories | September 30, 2011 | | December 31, 2010 | | (in thousands) | Materials | $ | 132,309 |
| | $ | 106,021 |
| Work in process | 17,209 |
| | 18,389 |
| Finished goods | 91,047 |
| | 83,747 |
| Total inventories | $ | 240,565 |
| | $ | 208,157 |
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| Property, Plant, and Equipment [Table Text Block] | | | | | | | | | | Property, plant, and equipment, net | September 30, 2011 | | December 31, 2010 | | (in thousands) | Machinery and equipment | $ | 281,205 |
| | $ | 265,113 |
| Computers and purchased software | 75,657 |
| | 63,077 |
| Buildings, furniture, and improvements | 146,841 |
| | 146,661 |
| Land | 32,402 |
| | 35,968 |
| Construction in progress, including purchased equipment | 20,104 |
| | 20,531 |
| Total cost | 556,209 |
| | 531,350 |
| Accumulated depreciation | (268,644 | ) | | (232,108 | ) | Property, plant, and equipment, net | $ | 287,565 |
| | $ | 299,242 |
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| Depreciation Expense [Table Text Block] |
| | | | | | | | | | | | | | | | | Depreciation expense | Three Months Ended September 30, | | Nine Months Ended September 30, | | 2011 | | 2010 | | 2011 | | 2010 | | (in thousands) | Depreciation expense | $ | 16,607 |
| | $ | 15,231 |
| | $ | 49,112 |
| | $ | 45,725 |
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