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Supplemental Cash Flow Information (Tables) | 6 Months Ended
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Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information |
|  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
|  | (in thousands) |
Net cash provided from operating activities included: |  |  |  |  |  |  |  |
Income taxes refunded (paid) to taxing authorities |  | $ | 7,521 |  |  | $ | (98 | )
Interest paid |  |  | (103,439 | ) |  |  | (84,653 | )
Non-cash investing and financing activities included: |  |  |  |  |  |  |  |
Increase in asset retirement costs capitalized |  |  | 19,561 |  |  |  | 3,855 |
(Decrease) increase in accrued capital expenditures |  |  | (102,809 | ) |  |  | 36,926 |

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