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Certain Balance Sheet Components | 12 Months Ended
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Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract] |
Certain Balance Sheet Components | A summary of accounts receivable from contracts with customers is as follows:
Accounts receivable, net |  |  |
In thousands | December 31, 2020 |  | December 31, 2019
Trade receivables (net of allowance of $1,312 and $3,064) | $ | 318,269 |  |  | $ | 415,887 |
Unbilled receivables | 51,559 |  |  | 57,038 |
Total accounts receivable, net | $ | 369,828 |  |  | $ | 472,925 |
Allowance for credit losses account activity | Year Ended December 31,
In thousands | 2020 |  | 2019 |  | 2018
Beginning balance | $ | 3,064 |  |  | $ | 6,331 |  |  | $ | 3,957 |
Provision for (release of) doubtful accounts, net | (299) |  |  | (1,511) |  |  | 3,874 |
Accounts written-off | (1,463) |  |  | (1,749) |  |  | (1,281) |
Effect of change in exchange rates | 10 |  |  | (7) |  |  | (219) |
Ending balance | $ | 1,312 |  |  | $ | 3,064 |  |  | $ | 6,331 |
Inventories |  |  |
In thousands | December 31, 2020 |  | December 31, 2019
Raw materials | $ | 114,058 |  |  | $ | 120,861 |
Work in process | 8,094 |  |  | 11,105 |
Finished goods | 60,225 |  |  | 95,930 |
Total inventories | $ | 182,377 |  |  | $ | 227,896 |
Property, plant, and equipment, net |  |  |
In thousands | December 31, 2020 |  | December 31, 2019
Machinery and equipment | $ | 334,050 |  |  | $ | 323,003 |
Computers and software | 115,776 |  |  | 109,924 |
Buildings, furniture, and improvements | 155,676 |  |  | 149,471 |
Land | 14,303 |  |  | 14,988 |
Construction in progress, including purchased equipment | 31,425 |  |  | 54,490 |
Total cost | 651,230 |  |  | 651,876 |
Accumulated depreciation | (443,414) |  |  | (418,648) |
Property, plant, and equipment, net | $ | 207,816 |  |  | $ | 233,228 |
Depreciation expense | Year Ended December 31,
In thousands | 2020 |  | 2019 |  | 2018
Depreciation expense | $ | 52,579 |  |  | $ | 50,114 |  |  | $ | 50,784 |

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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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