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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Summary Of Activity Recorded Within The Allowance For Doubtful Accounts | The following table summarizes activity recorded within the allowance for doubtful accounts and contract assets balances for the years ended December 31 (in thousands):
| 2021 |  | 2020 |  | 2019
Beginning balance | $ | 3,529 |  |  | $ | 5,951 |  |  | $ | 6,170 |
Adoption of ASU 2016-13, cumulative-effect adjustment to retained earnings at January 1, 2020 | — |  |  | 385 |  |  | — |
Bad debt expense, net of recoveries | 898 |  |  | 1,321 |  |  | 2,577 |
Accounts written off against allowance and other adjustments | (689) |  |  | (4,128) |  |  | (2,796) |
Ending balance | $ | 3,738 |  |  | $ | 3,529 |  |  | $ | 5,951 |
Property, Plant and Equipment | The table below sets forth the depreciation expense recognized during the years ended December 31 (in thousands):
| 2021 |  | 2020 |  | 2019
Depreciation expense | $ | 13,110 |  |  | $ | 11,252 |  |  | $ | 10,666 |
Components of property, plant, and equipment at December 31 consisted of the following (in thousands):
| 2021 |  | 2020
Land and land improvements | $ | 4,634 |  |  | $ | 4,605 |
Building and improvements | 42,526 |  |  | 41,164 |
Machinery and equipment | 194,015 |  |  | 188,853 |
Construction in progress | 20,293 |  |  | 10,458 |
Property, plant, and equipment, gross | 261,468 |  |  | 245,080 |
Less: accumulated depreciation | (164,583) |  |  | (155,518) |
Property, plant, and equipment, net | $ | 96,885 |  |  | $ | 89,562 |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | Recent Accounting Pronouncements Adopted
Standard |  | Description |  | Financial Statement Effect or Other Significant Matters
ASU No. 2019-12 Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes |  | The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and improve consistent application by clarifying and amending existing guidance. The amendments of this standard are effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. |  | The standard was effective for the Company as of January 1, 2021. The Company adopted the amendments in this update and the adoption did not have a material impact to the Company’s financial statements. Date of adoption: Q1 2021
Recent Accounting Pronouncements Not Yet Adopted

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