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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information |
| Year Ended December 31, |
| 2014 |  |  | 2013 |  |  | 2012 |
| (in thousands) |
Net cash provided from operating activities included: |  |  |  |  |  |  |  |  |  |  |
Income taxes (refunded from) paid to taxing authorities | $ | (156 | ) |  | $ | (347 | ) |  | $ | 386 |
Interest paid |  | 165,530 |  |  |  | 159,137 |  |  |  | 153,249 |
Non-cash investing and financing activities included: |  |  |  |  |  |  |  |  |  |  |
Asset retirement costs capitalized, net | $ | 56,822 |  |  | $ | 76,373 |  |  | $ | 57,982 |
Increase (decrease) in accrued capital expenditures |  | 150,604 |  |  |  | 27,079 |  |  |  | (94,121 | )

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