Balance Sheet Related Disclosures [Abstract] | Period [Axis] |
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2016-01-01 - 2016-12-31 |
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Balance Sheet Related Disclosures [Abstract] | |
Accounts Receivable, Net [Table Text Block] | | | | | | | | | | Accounts receivable, net | December 31, 2016 | | December 31, 2015 | | (in thousands) | Trade receivables (net of allowance of $3,320 and $5,949) | $ | 299,870 |
| | $ | 298,550 |
| Unbilled receivables | 51,636 |
| | 32,345 |
| Total accounts receivable, net | $ | 351,506 |
| | $ | 330,895 |
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Allowance for Credit Losses on Financing Receivables [Table Text Block] | | | | | | | | | | Allowance for doubtful account activity | Year Ended December 31, | | 2016 | | 2015 | | (in thousands) | Beginning balance | $ | 5,949 |
| | $ | 6,195 |
| Provision for doubtful accounts, net | 60 |
| | 1,025 |
| Accounts written-off | (2,422 | ) | | (549 | ) | Effects of change in exchange rates | (267 | ) | | (722 | ) | Ending balance | $ | 3,320 |
| | $ | 5,949 |
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Inventories [Table Text Block] | | | | | | | | | | Inventories | December 31, 2016 | | December 31, 2015 | | (in thousands) | Materials | $ | 103,274 |
| | $ | 111,191 |
| Work in process | 7,925 |
| | 9,400 |
| Finished goods | 51,850 |
| | 69,874 |
| Total inventories | $ | 163,049 |
| | $ | 190,465 |
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Property, Plant, and Equipment [Table Text Block] | | | | | | | | | | Property, plant, and equipment, net | December 31, 2016 | | December 31, 2015 | | (in thousands) | Machinery and equipment | $ | 279,746 |
| | $ | 289,015 |
| Computers and software | 98,125 |
| | 104,310 |
| Buildings, furniture, and improvements | 122,680 |
| | 127,531 |
| Land | 17,179 |
| | 19,882 |
| Construction in progress, including purchased equipment | 29,358 |
| | 32,639 |
| Total cost | 547,088 |
| | 573,377 |
| Accumulated depreciation | (370,630 | ) | | (383,121 | ) | Property, plant, and equipment, net | $ | 176,458 |
| | $ | 190,256 |
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Depreciation Expense [Table Text Block] | | | | | | | | | | | | | | Depreciation expense | Year Ended December 31, | | 2016 | | 2015 | | 2014 | | (in thousands) | Depreciation expense | $ | 43,206 |
| | $ | 44,320 |
| | $ | 54,435 |
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