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Certain Balance Sheet Components (Text Block) | 9 Months Ended
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Sep. 30, 2017
Balance Sheet Related Disclosures [Abstract] |
Certain Balance Sheet Components [Text Block] | Certain Balance Sheet Components
Accounts receivable, net | September 30, 2017 |  | December 31, 2016
| (in thousands)
Trade receivables (net of allowance of $3,991 and $3,320) | $ | 351,255 |  |  | $ | 299,870 |
Unbilled receivables | 24,894 |  |  | 51,636 |
Total accounts receivable, net | $ | 376,149 |  |  | $ | 351,506 |
Allowance for doubtful accounts activity | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Beginning balance | $ | 3,502 |  |  | $ | 3,939 |  |  | $ | 3,320 |  |  | $ | 5,949 |
Provision for doubtful accounts, net | 769 |  |  | 353 |  |  | 1,513 |  |  | 265 |
Accounts written-off | (310 | ) |  | (77 | ) |  | (1,115 | ) |  | (1,919 | )
Effect of change in exchange rates | 30 |  |  | 39 |  |  | 273 |  |  | (41 | )
Ending balance | $ | 3,991 |  |  | $ | 4,254 |  |  | $ | 3,991 |  |  | $ | 4,254 |
Inventories | September 30, 2017 |  | December 31, 2016
| (in thousands)
Materials | $ | 131,616 |  |  | $ | 103,274 |
Work in process | 9,158 |  |  | 7,925 |
Finished goods | 66,929 |  |  | 51,850 |
Total inventories | $ | 207,703 |  |  | $ | 163,049 |
Property, plant, and equipment, net | September 30, 2017 |  | December 31, 2016
| (in thousands)
Machinery and equipment | $ | 292,330 |  |  | $ | 279,746 |
Computers and software | 106,287 |  |  | 98,125 |
Buildings, furniture, and improvements | 134,536 |  |  | 122,680 |
Land | 18,596 |  |  | 17,179 |
Construction in progress, including purchased equipment | 37,846 |  |  | 29,358 |
Total cost | 589,595 |  |  | 547,088 |
Accumulated depreciation | (396,811 | ) |  | (370,630 | )
Property, plant, and equipment, net | $ | 192,784 |  |  | $ | 176,458 |
Depreciation expense | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Depreciation expense | $ | 10,907 |  |  | $ | 11,086 |  |  | $ | 30,856 |  |  | $ | 32,561 |

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- References No definition available. + Details
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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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