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Indebtedness - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 1,417,663 |
Unsecured Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | $ 2,613 | $ 3,554
Interest Rate | [1] | 3.14% |
Maturity Date | [2] | Oct. 29, 2021 |
Mortgage Loans Payable |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | $ 779 | 1,246
Extinguishment of debt, amount |  | 111,761 |
Net carrying value of industrial properties collateralized by mortgage loans |  | 280,649 |
Long-term Debt, Gross |  | 181,092 | 297,610
2014 Unsecured Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 200,000 | 200,000
Interest Rate | [1] | 3.39% |
Maturity Date | [1] | Jan. 29, 2021 |
2015 Unsecured Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 260,000 | 260,000
Interest Rate | [1] | 2.89% |
Maturity Date | [1] | Sep. 12, 2022 |
2028 Private Placement Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 150,000 | 150,000
Interest Rate |  | 3.86% |
Effective Interest Rate |  | 3.86% |
Maturity Date |  | Feb. 15, 2028 |
2029 II Private Placement Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 150,000 | 0
Interest Rate |  | 3.97% |
Effective Interest Rate |  | 4.23% |
Maturity Date |  | Jul. 23, 2029 |
2030 Private Placement Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 150,000 | $ 150,000
Interest Rate |  | 3.96% |
Effective Interest Rate |  | 3.96% |
Maturity Date |  | Feb. 15, 2030 |
[1] | The interest rate at September 30, 2019 also reflects the derivative instruments 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 $2,613 and $3,554 as of September 30, 2019 and December 31, 2018, respectively, which are included in the line item Prepaid Expenses and Other Assets, Net.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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