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Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | [1]
Net cash provided from operating activities included: |  |  |  |
Income taxes refunded from taxing authorities | $ 0 |  | $ 2,154 |
Interest paid | (87,337) |  | (78,265) |
Non-cash investing and financing activities included: |  |  |  |
Increase in asset retirement costs capitalized | 2,098 | [1] | 4,247 | $ 2,610
Increase (decrease) in accrued capital expenditures | $ 3,185 |  | $ (31,307) |
[1] | Includes costs incurred whether capitalized or expensed.

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