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Certain Balance Sheet Components | 6 Months Ended
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Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract] |
Certain Balance Sheet Components | Certain Balance Sheet Components A summary of accounts receivable from contracts with customers is as follows:
Accounts receivable, net | June 30, 2018 |  | December 31, 2017
| (in thousands)
Trade receivables (net of allowance of $4,552 and $3,957) | $ | 412,848 |  |  | $ | 369,047 |
Unbilled receivables | 30,546 |  |  | 28,982 |
Total accounts receivable, net | $ | 443,394 |  |  | $ | 398,029 |
Allowance for doubtful accounts activity | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Beginning balance | $ | 4,774 |  |  | $ | 3,424 |  |  | $ | 3,957 |  |  | $ | 3,320 |
Provision for doubtful accounts, net | 334 |  |  | 441 |  |  | 1,254 |  |  | 744 |
Accounts written-off | (247 | ) |  | (475 | ) |  | (505 | ) |  | (805 | )
Effect of change in exchange rates | (309 | ) |  | 112 |  |  | (154 | ) |  | 243 |
Ending balance | $ | 4,552 |  |  | $ | 3,502 |  |  | $ | 4,552 |  |  | $ | 3,502 |
Inventories | June 30, 2018 |  | December 31, 2017
| (in thousands)
Materials | $ | 125,917 |  |  | $ | 126,656 |
Work in process | 8,953 |  |  | 9,863 |
Finished goods | 60,186 |  |  | 57,316 |
Total inventories | $ | 195,056 |  |  | $ | 193,835 |
Property, plant, and equipment, net | June 30, 2018 |  | December 31, 2017
| (in thousands)
Machinery and equipment | $ | 310,855 |  |  | $ | 310,753 |
Computers and software | 110,758 |  |  | 104,384 |
Buildings, furniture, and improvements | 145,893 |  |  | 135,566 |
Land | 15,457 |  |  | 18,433 |
Construction in progress, including purchased equipment | 45,370 |  |  | 39,946 |
Total cost | 628,333 |  |  | 609,082 |
Accumulated depreciation | (404,898 | ) |  | (408,314 | )
Property, plant, and equipment, net | $ | 223,435 |  |  | $ | 200,768 |
Depreciation expense | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Depreciation expense | $ | 12,908 |  |  | $ | 10,120 |  |  | $ | 26,240 |  |  | $ | 19,949 |

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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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