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Financial Instruments and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Debt Instruments with Carrying Values Different from Estimated Fair Values | Debt instruments with carrying values that are different from estimated fair values are summarized as follows (in thousands):
| December 31, 2019 |  |  | December 31, 2018 |
| Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Senior Notes | $ | 1,647,963 |  |  | $ | 1,744,581 |  |  | $ | 1,646,007 |  |  | $ | 1,639,827 |
Revolving Credit Facilities and term loan |  | 104,460 |  |  |  | 105,084 |  |  |  | 149,655 |  |  |  | 150,533 |
Mortgage Indebtedness |  | 94,874 |  |  |  | 96,276 |  |  |  | 88,743 |  |  |  | 89,228 |
| $ | 1,847,297 |  |  | $ | 1,945,941 |  |  | $ | 1,884,405 |  |  | $ | 1,879,588 |

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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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