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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Accounts Receivable, Doubtful Accounts Table | The allowance for doubtful accounts is determined on a specific identification basis when we believe that the collection of specific amounts owed to us is not probable. Changes in the allowance are as follows:
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  | 2019
|  | (In Thousands)
At beginning of period |  | $ | 6,824 |  |  | $ | 1,912 |  |  | $ | 1,354 |
Activity in the period: |  |  |  |  |  |
Provision for doubtful accounts |  | (4) |  |  | 5,672 |  |  | 2,580 |
Account (charge offs) recoveries, net |  | (6,531) |  |  | (760) |  |  | (2,022) |
At end of period |  | $ | 289 |  |  | $ | 6,824 |  |  | $ | 1,912 |
Property, Plant, and Equipment Table | Property, plant, and equipment are stated at cost. Expenditures that increase the useful lives of assets are capitalized. The cost of repairs and maintenance is charged to operations as incurred. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which are generally as follows:
Buildings |  | 25 years
Machinery and equipment |  | 3 – 10 years
Automobiles and trucks |  | 4 – 5 years
Chemical plants |  | 15 – 30 years
Schedule of Cash Flow, Supplemental Disclosures | Supplemental cash flow information from continuing and discontinued operations is as follows:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
| (in thousands)
Supplemental cash flow information(1): |  |  |  |  |
Interest paid | $ | 14,347 |  |  | $ | 63,935 |  |  | $ | 68,332 |
Income taxes paid | 2,100 |  |  | 5,633 |  |  | 7,274 |
Accrued capital expenditures at year end | 7,491 |  |  | 1,573 |  |  | 3,625 |
(1) Prior-year information includes the activity for CSI Compressco for the full period. Current-year information includes activity for CSI Compressco for January only.

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