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Supplemental Cash Flow Information (Tables) | 9 Months Ended
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Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information |
|  | Nine Months Ended September 30, |
|  | 2014 |  |  | 2013 |
|  | (in thousands) |
Net cash provided from operating activities included: |  |  |  |  |  |  |  |
Income taxes paid to (refunded from) taxing authorities |  | $ | 41 |  |  | $ | (237 | )
Interest paid |  |  | 144,596 |  |  |  | 129,043 |
Non-cash investing and financing activities included: |  |  |  |  |  |  |  |
Increase (decrease) in asset retirement costs capitalized |  |  | 7,815 |  |  |  | (964 | )
Increase in accrued capital expenditures |  |  | 41,707 |  |  |  | 32,776 |

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