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Certain Balance Sheet Components | 9 Months Ended
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Sep. 30, 2020
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, 2020 |  | December 31, 2019
Trade receivables (net of allowance of $1,846 and $3,064) | $ | 314,183 |  |  | $ | 415,887 |
Unbilled receivables | 72,737 |  |  | 57,038 |
Total accounts receivable, net | $ | 386,920 |  |  | $ | 472,925 |
Allowance for doubtful accounts activity | Three Months Ended September 30, |  | Nine Months Ended September 30,
In thousands | 2020 |  | 2019 |  | 2020 |  | 2019
Beginning balance | $ | 2,102 |  |  | $ | 4,360 |  |  | $ | 3,064 |  |  | $ | 6,331 |
Provision for (release of) doubtful accounts, net | (21) |  |  | (1) |  |  | 318 |  |  | (1,739) |
Accounts written-off | (278) |  |  | (468) |  |  | (1,489) |  |  | (740) |
Effect of change in exchange rates | 43 |  |  | (105) |  |  | (47) |  |  | (66) |
Ending balance | $ | 1,846 |  |  | $ | 3,786 |  |  | $ | 1,846 |  |  | $ | 3,786 |
Inventories |  |  |
In thousands | September 30, 2020 |  | December 31, 2019
Raw materials | $ | 124,662 |  |  | $ | 120,861 |
Work in process | 9,016 |  |  | 11,105 |
Finished goods | 71,500 |  |  | 95,930 |
Total inventories | $ | 205,178 |  |  | $ | 227,896 |
Property, plant, and equipment, net |  |  |
In thousands | September 30, 2020 |  | December 31, 2019
Machinery and equipment | $ | 306,367 |  |  | $ | 323,003 |
Computers and software | 113,639 |  |  | 109,924 |
Buildings, furniture, and improvements | 151,795 |  |  | 149,471 |
Land | 13,771 |  |  | 14,988 |
Construction in progress, including purchased equipment | 33,661 |  |  | 54,490 |
Total cost | 619,233 |  |  | 651,876 |
Accumulated depreciation | (413,303) |  |  | (418,648) |
Property, plant, and equipment, net | $ | 205,930 |  |  | $ | 233,228 |
Depreciation expense | Three Months Ended September 30, |  | Nine Months Ended September 30,
In thousands | 2020 |  | 2019 |  | 2020 |  | 2019
Depreciation expense | $ | 12,893 |  |  | $ | 12,528 |  |  | $ | 38,818 |  |  | $ | 37,506 |

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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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