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Certain Balance Sheet Components | 6 Months Ended
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Jun. 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 | June 30, 2020 |  | December 31, 2019
Trade receivables (net of allowance of $2,102 and $3,064) | $ | 330,283 |  |  | $ | 415,887 |
Unbilled receivables | 80,917 |  |  | 57,038 |
Total accounts receivable, net | $ | 411,200 |  |  | $ | 472,925 |
Allowance for doubtful accounts activity | Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
In thousands | 2020 |  | 2019 |  | 2020 |  | 2019
Beginning balance | $ | 3,046 |  |  | $ | 4,046 |  |  | $ | 3,064 |  |  | $ | 6,331 |
Provision for (release of) doubtful accounts, net | (171) |  |  | 365 |  |  | 339 |  |  | (1,738) |
Accounts written-off | (796) |  |  | (80) |  |  | (1,211) |  |  | (272) |
Effect of change in exchange rates | 23 |  |  | 29 |  |  | (90) |  |  | 39 |
Ending balance | $ | 2,102 |  |  | $ | 4,360 |  |  | $ | 2,102 |  |  | $ | 4,360 |
Inventories |  |  |
In thousands | June 30, 2020 |  | December 31, 2019
Raw materials | $ | 139,035 |  |  | $ | 120,861 |
Work in process | 10,454 |  |  | 11,105 |
Finished goods | 77,075 |  |  | 95,930 |
Total inventories | $ | 226,564 |  |  | $ | 227,896 |
Property, plant, and equipment, net |  |  |
In thousands | June 30, 2020 |  | December 31, 2019
Machinery and equipment | $ | 302,385 |  |  | $ | 323,003 |
Computers and software | 111,774 |  |  | 109,924 |
Buildings, furniture, and improvements | 151,440 |  |  | 149,471 |
Land | 13,771 |  |  | 14,988 |
Construction in progress, including purchased equipment | 43,125 |  |  | 54,490 |
Total cost | 622,495 |  |  | 651,876 |
Accumulated depreciation | (406,176) |  |  | (418,648) |
Property, plant, and equipment, net | $ | 216,319 |  |  | $ | 233,228 |
Depreciation expense | Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
In thousands | 2020 |  | 2019 |  | 2020 |  | 2019
Depreciation expense | $ | 13,059 |  |  | $ | 12,594 |  |  | $ | 25,925 |  |  | $ | 24,978 |

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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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