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Certain Balance Sheet Components (Text Block) | 3 Months Ended
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Mar. 31, 2018
Balance Sheet Related Disclosures [Abstract] |
Certain Balance Sheet Components [Text Block] | Certain Balance Sheet Components A summary of accounts receivable from contracts with customers is as follows:
| March 31, 2018 |  | December 31, 2017
| (in thousands)
Trade receivables (net of allowance of $4,774 and $3,957) | $ | 448,211 |  |  | $ | 369,047 |
Unbilled receivables | 33,178 |  |  | 28,982 |
Total accounts receivable, net | $ | 481,389 |  |  | $ | 398,029 |
Allowance for doubtful accounts activity | Three Months Ended March 31,
| 2018 |  | 2017
| (in thousands)
Beginning balance | $ | 3,957 |  |  | $ | 3,320 |
Provision for doubtful accounts, net | 920 |  |  | 303 |
Accounts written-off | (258 | ) |  | (330 | )
Effect of change in exchange rates | 155 |  |  | 131 |
Ending balance | $ | 4,774 |  |  | $ | 3,424 |
Inventories | March 31, 2018 |  | December 31, 2017
| (in thousands)
Materials | $ | 132,990 |  |  | $ | 126,656 |
Work in process | 8,700 |  |  | 9,863 |
Finished goods | 67,683 |  |  | 57,316 |
Total inventories | $ | 209,373 |  |  | $ | 193,835 |
Property, plant, and equipment, net | March 31, 2018 |  | December 31, 2017
| (in thousands)
Machinery and equipment | $ | 332,055 |  |  | $ | 310,753 |
Computers and software | 111,227 |  |  | 104,384 |
Buildings, furniture, and improvements | 150,049 |  |  | 135,566 |
Land | 16,638 |  |  | 18,433 |
Construction in progress, including purchased equipment | 41,959 |  |  | 39,946 |
Total cost | 651,928 |  |  | 609,082 |
Accumulated depreciation | (417,004 | ) |  | (408,314 | )
Property, plant, and equipment, net | $ | 234,924 |  |  | $ | 200,768 |
Depreciation expense | Three Months Ended March 31,
| 2018 |  | 2017
| (in thousands)
Depreciation expense | $ | 13,332 |  |  | $ | 9,829 |

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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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