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Certain Balance Sheet Components Certain Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract] |
Accounts Receivable, Net [Table Text Block] |
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 Credit Losses on Financing Receivables [Table Text Block] |
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 [Table Text Block] |
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 [Table Text Block] |
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 [Table Text Block] |
Depreciation expense | Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Depreciation expense | $ | 42,430 |  |  | $ | 43,206 |  |  | $ | 44,320 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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