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Debt, Net (Details 2) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Amount |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | $ 1,871,445 | $ 1,828,333
Carrying Amount | Unsecured senior notes |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 1,190,139 | 1,189,249
Carrying Amount | Other fixed-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 150,178 | 152,010
Carrying Amount | Variable-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 531,128 | 487,074
Estimated Fair Value |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 1,899,265 | 1,867,577
Estimated Fair Value | Unsecured senior notes |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 1,220,040 | 1,229,398
Estimated Fair Value | Other fixed-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | 148,257 | 152,485
Estimated Fair Value | Variable-rate debt |  |
Carrying amount and estimated fair value of debt |  |
Long-term debt | $ 530,968 | $ 485,694

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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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