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Certain Balance Sheet Components | 9 Months Ended
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Sep. 30, 2019
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 |  |  |
In thousands | September 30, 2019 |  | December 31, 2018
Trade receivables (net of allowance of $3,786 and $6,331) | $ | 410,391 |  |  | $ | 416,503 |
Unbilled receivables | 58,086 |  |  | 20,658 |
Total accounts receivable, net | $ | 468,477 |  |  | $ | 437,161 |
Allowance for doubtful accounts activity | Three Months Ended September 30, |  | Nine Months Ended September 30,
In thousands | 2019 |  | 2018 |  | 2019 |  | 2018
Beginning balance | $ | 4,360 |  |  | $ | 4,552 |  |  | $ | 6,331 |  |  | $ | 3,957 |
Provision for (release of) doubtful accounts, net | (1 | ) |  | (105 | ) |  | (1,739 | ) |  | 1,149 |
Accounts written-off | (468 | ) |  | (624 | ) |  | (740 | ) |  | (1,129 | )
Effect of change in exchange rates | (105 | ) |  | (1 | ) |  | (66 | ) |  | (155 | )
Ending balance | $ | 3,786 |  |  | $ | 3,822 |  |  | $ | 3,786 |  |  | $ | 3,822 |
Inventories |  |  |
In thousands | September 30, 2019 |  | December 31, 2018
Raw materials | $ | 123,964 |  |  | $ | 133,398 |
Work in process | 10,980 |  |  | 9,744 |
Finished goods | 96,137 |  |  | 77,532 |
Total inventories | $ | 231,081 |  |  | $ | 220,674 |
Property, plant, and equipment, net |  |  |
In thousands | September 30, 2019 |  | December 31, 2018
Machinery and equipment | $ | 316,787 |  |  | $ | 315,974 |
Computers and software | 107,907 |  |  | 104,290 |
Buildings, furniture, and improvements | 148,870 |  |  | 146,071 |
Land | 14,763 |  |  | 14,980 |
Construction in progress, including purchased equipment | 51,306 |  |  | 49,682 |
Total cost | 639,633 |  |  | 630,997 |
Accumulated depreciation | (413,975 | ) |  | (404,446 | )
Property, plant, and equipment, net | $ | 225,658 |  |  | $ | 226,551 |
Depreciation expense | Three Months Ended September 30, |  | Nine Months Ended September 30,
In thousands | 2019 |  | 2018 |  | 2019 |  | 2018
Depreciation expense | $ | 12,528 |  |  | $ | 12,489 |  |  | $ | 37,506 |  |  | $ | 38,729 |

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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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