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Debt, Net (Details 2) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Carrying Amount |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | $ 1,876,149 | $ 1,823,909
Carrying Amount | Unsecured senior notes |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 1,191,506 | 1,191,046
Carrying Amount | Other fixed-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 147,347 | 148,308
Carrying Amount | Variable-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 537,296 | 484,555
Estimated Fair Value |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 1,910,137 | 1,853,206
Estimated Fair Value | Unsecured senior notes |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 1,222,637 | 1,219,603
Estimated Fair Value | Other fixed-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 146,585 | 147,106
Estimated Fair Value | Variable-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | $ 540,915 | $ 486,497

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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