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Certain Balance Sheet Components | 12 Months Ended
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Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract] |
Certain Balance Sheet Components | Certain Balance Sheet Components
Accounts receivable, net | December 31, 2018 |  | December 31, 2017
| (in thousands)
Trade receivables (net of allowance of $6,331 and $3,957) | $ | 416,503 |  |  | $ | 369,047 |
Unbilled receivables | 20,658 |  |  | 28,982 |
Total accounts receivable, net | $ | 437,161 |  |  | $ | 398,029 |
Allowance for doubtful account activity | Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Beginning balance | $ | 3,957 |  |  | $ | 3,320 |  |  | $ | 5,949 |
Provision for doubtful accounts, net | 3,874 |  |  | 1,656 |  |  | 60 |
Accounts written-off | (1,281 | ) |  | (1,351 | ) |  | (2,422 | )
Effects of change in exchange rates | (219 | ) |  | 332 |  |  | (267 | )
Ending balance | $ | 6,331 |  |  | $ | 3,957 |  |  | $ | 3,320 |
Inventories | December 31, 2018 |  | December 31, 2017
| (in thousands)
Materials | $ | 133,398 |  |  | $ | 126,656 |
Work in process | 9,744 |  |  | 9,863 |
Finished goods | 77,532 |  |  | 57,316 |
Total inventories | $ | 220,674 |  |  | $ | 193,835 |
Property, plant, and equipment, net | December 31, 2018 |  | December 31, 2017
| (in thousands)
Machinery and equipment | $ | 315,974 |  |  | $ | 310,753 |
Computers and software | 104,290 |  |  | 104,384 |
Buildings, furniture, and improvements | 146,071 |  |  | 135,566 |
Land | 14,980 |  |  | 18,433 |
Construction in progress, including purchased equipment | 49,682 |  |  | 39,946 |
Total cost | 630,997 |  |  | 609,082 |
Accumulated depreciation | (404,446 | ) |  | (408,314 | )
Property, plant, and equipment, net | $ | 226,551 |  |  | $ | 200,768 |
Depreciation expense | Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Depreciation expense | $ | 50,784 |  |  | $ | 42,430 |  |  | $ | 43,206 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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