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Certain Balance Sheet Components | 9 Months Ended
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Sep. 30, 2021
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 | September 30, 2021 |  | December 31, 2020
Trade receivables (net of allowance of $2,798 and $1,312) | $ | 274,385 |  |  | $ | 318,269 |
Unbilled receivables | 46,609 |  |  | 51,559 |
Total accounts receivable, net | $ | 320,994 |  |  | $ | 369,828 |
Allowance for credit losses account activity | Three Months Ended September 30, |  | Nine Months Ended September 30,
In thousands | 2021 |  | 2020 |  | 2021 |  | 2020
Beginning balance | $ | 1,107 |  |  | $ | 2,102 |  |  | $ | 1,312 |  |  | $ | 3,064 |
Provision for (release of) doubtful accounts, net | 2,164 |  |  | (21) |  |  | 2,122 |  |  | 318 |
Accounts written-off | (440) |  |  | (278) |  |  | (582) |  |  | (1,489) |
Effect of change in exchange rates | (33) |  |  | 43 |  |  | (54) |  |  | (47) |
Ending balance | $ | 2,798 |  |  | $ | 1,846 |  |  | $ | 2,798 |  |  | $ | 1,846 |
Inventories |  |  |
In thousands | September 30, 2021 |  | December 31, 2020
Raw materials | $ | 117,549 |  |  | $ | 114,058 |
Work in process | 8,539 |  |  | 8,094 |
Finished goods | 49,344 |  |  | 60,225 |
Total inventories | $ | 175,432 |  |  | $ | 182,377 |
Property, plant, and equipment, net |  |  |
In thousands | September 30, 2021 |  | December 31, 2020
Machinery and equipment | $ | 333,584 |  |  | $ | 334,050 |
Computers and software | 117,067 |  |  | 115,776 |
Buildings, furniture, and improvements | 146,052 |  |  | 155,676 |
Land | 11,976 |  |  | 14,303 |
Construction in progress, including purchased equipment | 40,082 |  |  | 31,425 |
Total cost | 648,761 |  |  | 651,230 |
Accumulated depreciation | (459,013) |  |  | (443,414) |
Property, plant, and equipment, net | $ | 189,748 |  |  | $ | 207,816 |
Depreciation expense | Three Months Ended September 30, |  | Nine Months Ended September 30,
In thousands | 2021 |  | 2020 |  | 2021 |  | 2020
Depreciation expense | $ | 12,389 |  |  | $ | 12,893 |  |  | $ | 37,338 |  |  | $ | 38,818 |

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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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