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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2018
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,
| 2018 |  | 2017 |  | 2016
Cash paid during the year for: |  |  |  |  |
Income taxes (net of refunds of $21,459, $17,522 and $9,270 in 2018, 2017 and 2016, respectively)(a) | $ | 157,758 |  |  | $ | 320,222 |  |  | $ | 143,404 |
Interest (net of capitalization) | $ | 49,762 |  |  | $ | 61,243 |  |  | $ | 96,948 |
Supplemental non-cash disclosures related to investing activities: |  |  |  |  |
Capital expenditures included in Accounts payable | $ | 134,784 |  |  | $ | 89,188 |  |  | $ | 33,622 |
(a) | Includes approximately $41 million of income taxes paid in 2018 from the gain on sale of the Polyolefin Catalysts Divestiture, and $257 million of income taxes paid in 2017 from the gain on sale of the Chemetall Surface Treatment business.

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