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Certain Balance Sheet Components | 3 Months Ended
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Mar. 31, 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 | March 31, 2021 |  | December 31, 2020
Trade receivables (net of allowance of $1,136 and $1,312) | $ | 319,052 |  |  | $ | 318,269 |
Unbilled receivables | 46,774 |  |  | 51,559 |
Total accounts receivable, net | $ | 365,826 |  |  | $ | 369,828 |
Allowance for credit losses account activity | Three Months Ended March 31, |  |
In thousands | 2021 |  | 2020 |  |  |  |
Beginning balance | $ | 1,312 |  |  | $ | 3,064 |  |  |  |  |
Provision for (release of) doubtful accounts, net | (67) |  |  | 510 |  |  |  |  |
Accounts written-off | (79) |  |  | (415) |  |  |  |  |
Effect of change in exchange rates | (30) |  |  | (113) |  |  |  |  |
Ending balance | $ | 1,136 |  |  | $ | 3,046 |  |  |  |  |
Inventories |  |  |
In thousands | March 31, 2021 |  | December 31, 2020
Raw materials | $ | 109,314 |  |  | $ | 114,058 |
Work in process | 9,287 |  |  | 8,094 |
Finished goods | 50,811 |  |  | 60,225 |
Total inventories | $ | 169,412 |  |  | $ | 182,377 |
Property, plant, and equipment, net |  |  |
In thousands | March 31, 2021 |  | December 31, 2020
Machinery and equipment | $ | 333,973 |  |  | $ | 334,050 |
Computers and software | 116,121 |  |  | 115,776 |
Buildings, furniture, and improvements | 153,246 |  |  | 155,676 |
Land | 13,900 |  |  | 14,303 |
Construction in progress, including purchased equipment | 30,207 |  |  | 31,425 |
Total cost | 647,447 |  |  | 651,230 |
Accumulated depreciation | (447,797) |  |  | (443,414) |
Property, plant, and equipment, net | $ | 199,650 |  |  | $ | 207,816 |
Depreciation expense |  |  | Three Months Ended March 31,
In thousands |  |  |  |  | 2021 |  | 2020
Depreciation expense |  |  |  |  | $ | 12,837 |  |  | $ | 12,866 |

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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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