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Fair Value of Financial Instruments (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2015
Fair Value Disclosures [Abstract] |
Fair Value of Long-Term Debt |
| September 30, 2015 |  | December 31, 2014
| Recorded Amount |  | Fair Value |  | Recorded Amount |  | Fair Value
| (In thousands)
Long-term debt | $ | 3,843,332 |  |  | $ | 3,882,165 |  |  | $ | 2,934,131 |  |  | $ | 2,994,935 |

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