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Certain Balance Sheet Components (Tables) | 3 Months Ended
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Mar. 31, 2020
Balance Sheet Related Disclosures [Abstract] |
Accounts Receivable, Net | 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 Credit Losses on Financing Receivables |
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 |
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 |
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 |
Depreciation expense |  |  |  |  | Three Months Ended March 31, |  |
In thousands |  |  |  |  | 2020 |  | 2019
Depreciation expense |  |  |  |  | $ | 12,866 |  |  | $ | 12,384 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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