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Certain Balance Sheet Components (Text Block) | 12 Months Ended
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Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract] |
Certain Balance Sheet Components [Text Block] | Certain Balance Sheet Components
Accounts receivable, net | December 31, 2017 |  | December 31, 2016
| (in thousands)
Trade receivables (net of allowance of $3,957 and $3,320) | $ | 369,047 |  |  | $ | 299,870 |
Unbilled receivables | 28,982 |  |  | 51,636 |
Total accounts receivable, net | $ | 398,029 |  |  | $ | 351,506 |
Allowance for doubtful account activity | Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Beginning balance | $ | 3,320 |  |  | $ | 5,949 |  |  | $ | 6,195 |
Provision for doubtful accounts, net | 1,656 |  |  | 60 |  |  | 1,025 |
Accounts written-off | (1,351 | ) |  | (2,422 | ) |  | (549 | )
Effects of change in exchange rates | 332 |  |  | (267 | ) |  | (722 | )
Ending balance | $ | 3,957 |  |  | $ | 3,320 |  |  | $ | 5,949 |
Inventories | December 31, 2017 |  | December 31, 2016
| (in thousands)
Materials | $ | 126,656 |  |  | $ | 103,274 |
Work in process | 9,863 |  |  | 7,925 |
Finished goods | 57,316 |  |  | 51,850 |
Total inventories | $ | 193,835 |  |  | $ | 163,049 |
Property, plant, and equipment, net | December 31, 2017 |  | December 31, 2016
| (in thousands)
Machinery and equipment | $ | 310,753 |  |  | $ | 279,746 |
Computers and software | 104,384 |  |  | 98,125 |
Buildings, furniture, and improvements | 135,566 |  |  | 122,680 |
Land | 18,433 |  |  | 17,179 |
Construction in progress, including purchased equipment | 39,946 |  |  | 29,358 |
Total cost | 609,082 |  |  | 547,088 |
Accumulated depreciation | (408,314 | ) |  | (370,630 | )
Property, plant, and equipment, net | $ | 200,768 |  |  | $ | 176,458 |
Depreciation expense | Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Depreciation expense | $ | 42,430 |  |  | $ | 43,206 |  |  | $ | 44,320 |

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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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