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Fair Value of Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2014
Fair Value Disclosures [Abstract] |
Fair Value of Long-Term Debt |
| December 31,
| 2014 |  | 2013
| Recorded Amount |  | Fair Value |  | Recorded Amount |  | Fair Value
| (In thousands)
Long-term debt | $ | 2,934,131 |  |  | $ | 2,994,935 |  |  | $ | 1,078,864 |  |  | $ | 1,109,878 |

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