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Indebtedness - Summary of Indebtedness at Estimated Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | $ 1,375,050 | $ 1,353,679
Fair Value |  | 1,417,784 | 1,384,111
Mortgage Loans Payable |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | 454,584 | 498,861
Fair Value |  | 466,999 | 513,540
Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | 303,466 | 205,318
Fair Value |  | 325,580 | 222,469
Unsecured Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | 460,000 | 460,000
Fair Value |  | 468,089 | 458,602
Unsecured Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Carrying Amount | [1] | 157,000 | 189,500
Fair Value |  | $ 157,116 | $ 189,500
[1] | The carrying amounts include unamortized premiums and discounts and exclude unamortized deferred financing costs.

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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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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