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Certain Balance Sheet Components | 12 Months Ended
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Dec. 31, 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 | December 31, 2019 |  | December 31, 2018
Trade receivables (net of allowance of $3,064 and $6,331) | $ | 415,887 |  |  | $ | 416,503 |
Unbilled receivables | 57,038 |  |  | 20,658 |
Total accounts receivable, net | $ | 472,925 |  |  | $ | 437,161 |
Allowance for doubtful account activity | Year Ended December 31, |  |  |  |
In thousands | 2019 |  | 2018 |  | 2017
Beginning balance | $ | 6,331 |  |  | $ | 3,957 |  |  | $ | 3,320 |
Provision for (release of) doubtful accounts, net | (1,511) |  |  | 3,874 |  |  | 1,656 |
Accounts written-off | (1,749) |  |  | (1,281) |  |  | (1,351) |
Effect of change in exchange rates | (7) |  |  | (219) |  |  | 332 |
Ending balance | $ | 3,064 |  |  | $ | 6,331 |  |  | $ | 3,957 |
Inventories |  |  |
In thousands | December 31, 2019 |  | December 31, 2018
Raw materials | $ | 120,861 |  |  | $ | 133,398 |
Work in process | 11,105 |  |  | 9,744 |
Finished goods | 95,930 |  |  | 77,532 |
Total inventories | $ | 227,896 |  |  | $ | 220,674 |
Property, plant, and equipment, net |  |  |
In thousands | December 31, 2019 |  | December 31, 2018
Machinery and equipment | $ | 323,003 |  |  | $ | 315,974 |
Computers and software | 109,924 |  |  | 104,290 |
Buildings, furniture, and improvements | 149,471 |  |  | 146,071 |
Land | 14,988 |  |  | 14,980 |
Construction in progress, including purchased equipment | 54,490 |  |  | 49,682 |
Total cost | 651,876 |  |  | 630,997 |
Accumulated depreciation | (418,648) |  |  | (404,446) |
Property, plant, and equipment, net | $ | 233,228 |  |  | $ | 226,551 |
Depreciation expense | Year Ended December 31, |  |  |  |
In thousands | 2019 |  | 2018 |  | 2017
Depreciation expense | $ | 50,114 |  |  | $ | 50,784 |  |  | $ | 42,430 |

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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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