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Certain Balance Sheet Components | 3 Months Ended
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Mar. 31, 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 | March 31, 2020 |  | December 31, 2019
Trade receivables (net of allowance of $3,046 and $3,064) | $ | 398,025 |  |  | $ | 415,887 |
Unbilled receivables | 65,588 |  |  | 57,038 |
Total accounts receivable, net | $ | 463,613 |  |  | $ | 472,925 |
Allowance for doubtful accounts activity |  |  |  |  | Three Months Ended March 31, |  |
In thousands |  |  |  |  | 2020 |  | 2019
Beginning balance |  |  |  |  | $ | 3,064 |  |  | $ | 6,331 |
Provision for (release of) doubtful accounts, net |  |  |  |  | 510 |  |  | (2,103) |
Accounts written-off |  |  |  |  | (415) |  |  | (192) |
Effect of change in exchange rates |  |  |  |  | (113) |  |  | 10 |
Ending balance |  |  |  |  | $ | 3,046 |  |  | $ | 4,046 |
Inventories |  |  |
In thousands | March 31, 2020 |  | December 31, 2019
Raw materials | $ | 133,285 |  |  | $ | 120,861 |
Work in process | 10,473 |  |  | 11,105 |
Finished goods | 78,092 |  |  | 95,930 |
Total inventories | $ | 221,850 |  |  | $ | 227,896 |
Property, plant, and equipment, net |  |  |
In thousands | March 31, 2020 |  | December 31, 2019
Machinery and equipment | $ | 311,771 |  |  | $ | 323,003 |
Computers and software | 111,501 |  |  | 109,924 |
Buildings, furniture, and improvements | 150,847 |  |  | 149,471 |
Land | 14,538 |  |  | 14,988 |
Construction in progress, including purchased equipment | 45,596 |  |  | 54,490 |
Total cost | 634,253 |  |  | 651,876 |
Accumulated depreciation | (408,328) |  |  | (418,648) |
Property, plant, and equipment, net | $ | 225,925 |  |  | $ | 233,228 |
Depreciation expense |  |  |  |  | Three Months Ended March 31, |  |
In thousands |  |  |  |  | 2020 |  | 2019
Depreciation expense |  |  |  |  | $ | 12,866 |  |  | $ | 12,384 |

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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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