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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Supplemental Cash Flow Information [Abstract] |
Supplemental Information Related to Consolidated Statements of Cash Flows | Supplemental information related to the consolidated statements of cash flows is as follows (in thousands):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Cash paid during the year for: |  |  |  |  |
Income taxes (net of refunds of $25,991, $7,438 and $21,459 in 2020, 2019 and 2018, respectively)(a) | $ | 52,103 |  |  | $ | 170,450 |  |  | $ | 157,758 |
Interest (net of capitalization) | $ | 66,379 |  |  | $ | 45,532 |  |  | $ | 49,762 |
Supplemental non-cash disclosures related to investing activities: |  |  |  |  |
Capital expenditures included in Accounts payable | $ | 139,120 |  |  | $ | 199,451 |  |  | $ | 134,784 |
(a)Includes approximately $41 million of income taxes paid in 2018 from the gain on sale of the Polyolefin Catalysts Divestiture.

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