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Supplemental Cash Flow Information (Tables) | 6 Months Ended
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Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information |
|  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |
|  | (in thousands) |
Net cash provided from operating activities included: |  |  |  |  |  |  |  |
Income taxes paid to (refunded) from taxing authorities |  | $ | 98 |  |  | $ | (101 | )
Interest paid |  |  | 84,653 |  |  |  | 69,991 |
Non-cash investing and financing activities included: |  |  |  |  |  |  |  |
Increase in asset retirement costs capitalized |  |  | 3,855 |  |  |  | 3,740 |
Increase (decrease) in accrued capital expenditures |  |  | 36,926 |  |  |  | (4,741 | )

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