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Financial Instruments and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
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):
| December 31, 2017 |  |  | December 31, 2016 |
| Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Senior Notes | $ | 2,810,100 |  |  | $ | 2,884,272 |  |  | $ | 2,913,217 |  |  | $ | 3,009,232 |
Revolving Credit Facilities and term loans |  | 398,130 |  |  |  | 400,119 |  |  |  | 598,242 |  |  |  | 600,050 |
Mortgage Indebtedness |  | 641,082 |  |  |  | 653,185 |  |  |  | 982,509 |  |  |  | 1,009,884 |
| $ | 3,849,312 |  |  | $ | 3,937,576 |  |  | $ | 4,493,968 |  |  | $ | 4,619,166 |

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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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