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Indebtedness - Summary of Indebtedness at Estimated Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Mortgage Loans Payable, Net |  | $ 305,018 | $ 467,303
Senior Unsecured Notes, Net |  | 540,952 | 269,731
Unsecured Term Loans |  | 461,426 | 460,000
Unsecured Credit Facility |  | 0 | 144,500
Total |  | 1,307,396 | 1,341,534
Carrying Amount (A) |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage Loans Payable, Net | [1] | 299,605 | 451,862
Senior Unsecured Notes, Net | [1] | 548,492 | 248,487
Unsecured Term Loans | [1] | 460,000 | 460,000
Unsecured Credit Facility | [1] | 0 | 144,500
Total | [1] | $ 1,308,097 | $ 1,304,849
[1] | The carrying amounts include unamortized premiums and discounts and exclude unamortized debt issuance costs.

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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 Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time. + 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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- Definition Fair value portion of notes payable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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