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Certain Balance Sheet Components (Text Block) | 6 Months Ended
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Jun. 30, 2017
Balance Sheet Related Disclosures [Abstract] |
Certain Balance Sheet Components [Text Block] | Certain Balance Sheet Components
Accounts receivable, net | June 30, 2017 |  | December 31, 2016
| (in thousands)
Trade receivables (net of allowance of $3,502 and $3,320) | $ | 345,738 |  |  | $ | 299,870 |
Unbilled receivables | 28,442 |  |  | 51,636 |
Total accounts receivable, net | $ | 374,180 |  |  | $ | 351,506 |
Allowance for doubtful accounts activity | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Beginning balance | $ | 3,424 |  |  | $ | 4,541 |  |  | $ | 3,320 |  |  | $ | 5,949 |
Provision (release) for doubtful accounts, net | 441 |  |  | (80 | ) |  | 744 |  |  | (88 | )
Accounts written-off | (475 | ) |  | (364 | ) |  | (805 | ) |  | (1,842 | )
Effect of change in exchange rates | 112 |  |  | (158 | ) |  | 243 |  |  | (80 | )
Ending balance | $ | 3,502 |  |  | $ | 3,939 |  |  | $ | 3,502 |  |  | $ | 3,939 |
Inventories | June 30, 2017 |  | December 31, 2016
| (in thousands)
Materials | $ | 124,363 |  |  | $ | 103,274 |
Work in process | 14,399 |  |  | 7,925 |
Finished goods | 64,872 |  |  | 51,850 |
Total inventories | $ | 203,634 |  |  | $ | 163,049 |
Property, plant, and equipment, net | June 30, 2017 |  | December 31, 2016
| (in thousands)
Machinery and equipment | $ | 297,314 |  |  | $ | 279,746 |
Computers and software | 105,570 |  |  | 98,125 |
Buildings, furniture, and improvements | 130,165 |  |  | 122,680 |
Land | 18,161 |  |  | 17,179 |
Construction in progress, including purchased equipment | 32,036 |  |  | 29,358 |
Total cost | 583,246 |  |  | 547,088 |
Accumulated depreciation | (396,740 | ) |  | (370,630 | )
Property, plant, and equipment, net | $ | 186,506 |  |  | $ | 176,458 |
Depreciation expense | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Depreciation expense | $ | 10,120 |  |  | $ | 11,011 |  |  | $ | 19,949 |  |  | $ | 21,475 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References No definition available. + Details
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