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Indebtedness - Summary of Indebtedness (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Mortgage Loans Payable, Net |  | $ 301,661 | $ 450,056
Senior Unsecured Notes, Net |  | 544,204 | 246,673
Unsecured Term Loans, Net |  | 456,016 | 455,768
Unsecured Credit Facility |  | 100,000 | 144,500
2027 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Unsecured Notes, Gross |  | $ 6,070 | 6,070
Interest Rate |  | 7.15% |
Effective Interest Rate |  | 7.11% |
Maturity Date |  | May 15, 2027 |
2028 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Unsecured Notes, Gross |  | $ 31,901 | 31,901
Interest Rate |  | 7.60% |
Effective Interest Rate |  | 8.13% |
Maturity Date |  | Jul. 15, 2028 |
2032 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Unsecured Notes, Gross |  | $ 10,600 | 10,600
Interest Rate |  | 7.75% |
Effective Interest Rate |  | 7.87% |
Maturity Date |  | Apr. 15, 2032 |
2027 Private Placement Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Unsecured Notes, Gross |  | $ 125,000 | 125,000
Interest Rate |  | 4.30% |
Effective Interest Rate |  | 4.30% |
Maturity Date |  | Apr. 20, 2027 |
2028 Private Placement Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Unsecured Notes, Gross |  | $ 150,000 | 0
Interest Rate |  | 3.86% |
Effective Interest Rate |  | 3.86% |
Maturity Date |  | Feb. 15, 2028 |
2029 Private Placement Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Unsecured Notes, Gross |  | $ 75,000 | 75,000
Interest Rate |  | 4.40% |
Effective Interest Rate |  | 4.40% |
Maturity Date |  | Apr. 20, 2029 |
2030 Private Placement Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Unsecured Notes, Gross |  | $ 150,000 | 0
Interest Rate |  | 3.96% |
Effective Interest Rate |  | 3.96% |
Maturity Date |  | Feb. 15, 2030 |
2014 Unsecured Term Loan (A) |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured Term Loans, Gross | [1] | $ 200,000 | 200,000
Interest Rate | [1] | 3.39% |
Maturity Date | [1] | Jan. 29, 2021 |
2015 Unsecured Term Loan (A) |  |  |
Debt Instrument [Line Items] |  |  |
Unsecured Term Loans, Gross | [1] | $ 260,000 | 260,000
Interest Rate | [1] | 2.89% |
Maturity Date | [1] | Sep. 12, 2022 |
Mortgage Loans Payable |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage Loans Payable, Gross |  | $ 303,093 | 451,602
Unamortized Debt Issuance Costs |  | (1,644) | (1,806)
Unamortized Premiums |  | 212 | 260
Mortgage Loans Payable, Net |  | $ 301,661 | 450,056
Maturity Date Range, Start |  | Jul. 01, 2019 |
Maturity Date Range, End |  | Aug. 01, 2028 |
Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | $ (4,285) | (1,814)
Senior Unsecured Notes, Gross |  | 548,571 | 248,571
Unamortized Discounts |  | 82 | 84
Senior Unsecured Notes, Net |  | 544,204 | 246,673
Unsecured Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | (3,984) | (4,232)
Unsecured Term Loans, Gross |  | 460,000 | 460,000
Unsecured Term Loans, Net |  | 456,016 | 455,768
Unsecured Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | (4,495) | (4,781)
Unsecured Credit Facility | [2] | $ 100,000 | $ 144,500
Interest Rate | [2] | 2.83% |
Maturity Date | [2] | Oct. 29, 2021 |
Minimum | Mortgage Loans Payable |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate |  | 4.03% |
Effective Interest Rate |  | 3.82% |
Maximum | Mortgage Loans Payable |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate |  | 8.26% |
Effective Interest Rate |  | 8.26% |
[1] | The interest rate at March 31, 2018 also reflects the interest rate protection agreements we entered into to effectively convert the variable rate to a fixed rate. See Note 10.
[2] | The maturity date may be extended an additional year at our election, subject to certain restrictions. Amounts exclude unamortized debt issuance costs of $4,495 and $4,781 as of March 31, 2018 and December 31, 2017, respectively, which are included in prepaid expenses and other assets on the consolidated balance sheets.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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