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Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | [1]
Net cash provided from operating activities included: |  |  |  |
Income taxes paid to taxing authorities | $ 0 |  | $ 39 |
Interest paid | 73,189 |  | 89,381 |
Non-cash investing and financing activities included: |  |  |  |
Increase in asset retirement costs capitalized | 18,684 | [1] | 5,516 | $ 56,822
(Decrease) increase in accrued capital expenditures | $ (156,897) |  | $ 15,211 |
[1] | Includes costs incurred whether capitalized or expensed.

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