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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2016
Fair Value Disclosures [Abstract] |
Debt Instruments with Carrying Values Different than Estimated Fair Values | Debt instruments with carrying values that are different than estimated fair values are summarized as follows (in thousands):
| June 30, 2016 |  |  | December 31, 2015 |
| Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Senior Notes | $ | 2,911,277 |  |  | $ | 3,147,137 |  |  | $ | 3,149,188 |  |  | $ | 3,292,723 |
Revolving Credit Facilities and term loans |  | 862,711 |  |  |  | 866,867 |  |  |  | 807,185 |  |  |  | 811,666 |
Mortgage Indebtedness |  | 1,164,819 |  |  |  | 1,222,427 |  |  |  | 1,183,164 |  |  |  | 1,235,139 |
| $ | 4,938,807 |  |  | $ | 5,236,431 |  |  | $ | 5,139,537 |  |  | $ | 5,339,528 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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