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Certain Balance Sheet Components | 9 Months Ended
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Sep. 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 | September 30, 2018 |  | December 31, 2017
| (in thousands)
Trade receivables (net of allowance of $3,822 and $3,957) | $ | 422,567 |  |  | $ | 369,047 |
Unbilled receivables | 27,025 |  |  | 28,982 |
Total accounts receivable, net | $ | 449,592 |  |  | $ | 398,029 |
Allowance for doubtful accounts activity | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Beginning balance | $ | 4,552 |  |  | $ | 3,502 |  |  | $ | 3,957 |  |  | $ | 3,320 |
Provision (recovery) for doubtful accounts, net | (105 | ) |  | 769 |  |  | 1,149 |  |  | 1,513 |
Accounts written-off | (624 | ) |  | (310 | ) |  | (1,129 | ) |  | (1,115 | )
Effect of change in exchange rates | (1 | ) |  | 30 |  |  | (155 | ) |  | 273 |
Ending balance | $ | 3,822 |  |  | $ | 3,991 |  |  | $ | 3,822 |  |  | $ | 3,991 |
Inventories | September 30, 2018 |  | December 31, 2017
| (in thousands)
Materials | $ | 128,744 |  |  | $ | 126,656 |
Work in process | 8,595 |  |  | 9,863 |
Finished goods | 70,699 |  |  | 57,316 |
Total inventories | $ | 208,038 |  |  | $ | 193,835 |
Property, plant, and equipment, net | September 30, 2018 |  | December 31, 2017
| (in thousands)
Machinery and equipment | $ | 318,218 |  |  | $ | 310,753 |
Computers and software | 112,681 |  |  | 104,384 |
Buildings, furniture, and improvements | 149,934 |  |  | 135,566 |
Land | 15,463 |  |  | 18,433 |
Construction in progress, including purchased equipment | 41,423 |  |  | 39,946 |
Total cost | 637,719 |  |  | 609,082 |
Accumulated depreciation | (416,924 | ) |  | (408,314 | )
Property, plant, and equipment, net | $ | 220,795 |  |  | $ | 200,768 |
Depreciation expense | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Depreciation expense | $ | 12,489 |  |  | $ | 10,907 |  |  | $ | 38,729 |  |  | $ | 30,856 |

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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://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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