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Indebtedness - Additional Information (Details) $ in Thousands, ft² in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) ft² Property | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) ft² Property | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Number of industrial properties | Property |  | 471 |  | 471 |  |
Gross leasable area (GLA) of industrial properties | ft² |  | 61.1 |  | 61.1 |  |
Loss from Retirement of Debt |  | $ 0 | $ 0 | $ (39) | $ (1,653) |
Long-term Debt, Gross |  | 1,309,863 |  | 1,309,863 |  |
Unsecured Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized Debt Issuance Costs |  | 4,182 |  | 4,182 |  | $ 4,781
Mortgage Loans Payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized Debt Issuance Costs |  | 1,490 |  | 1,490 |  | 1,806
Extinguishment of debt, amount |  |  |  | 157,782 |  |
Loss from Retirement of Debt |  |  |  | 39 |  |
Net carrying value of industrial properties collateralized by mortgage loans |  | 450,187 |  | 450,187 |  |
Long-term Debt, Gross |  | $ 301,292 |  | $ 301,292 |  | 451,602
2014 Unsecured Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Interest Rate Change Due to Investment Grade Rating |  |  |  | 10 basis point |  |
Interest Rate | [1] | 3.39% |  | 3.39% |  |
Long-term Debt, Gross |  | $ 200,000 |  | $ 200,000 |  | 200,000
2015 Unsecured Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Interest Rate Change Due to Investment Grade Rating |  |  |  | 10 basis point |  |
Interest Rate | [1] | 2.89% |  | 2.89% |  |
Long-term Debt, Gross |  | $ 260,000 |  | $ 260,000 |  | 260,000
Assumed Mortgage | Mortgage Loans Payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Assumed Mortgage Loan |  |  |  | $ 11,654 |  |
Number of industrial properties | Property |  | 3 |  | 3 |  |
Gross leasable area (GLA) of industrial properties | ft² |  | 0.2 |  | 0.2 |  |
Interest Rate |  | 4.17% |  | 4.17% |  |
2028 Private Placement Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  | 3.86% |  | 3.86% |  |
Long-term Debt, Gross |  | $ 150,000 |  | $ 150,000 |  | 0
Effective Interest Rate |  | 3.86% |  | 3.86% |  |
2030 Private Placement Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  | 3.96% |  | 3.96% |  |
Long-term Debt, Gross |  | $ 150,000 |  | $ 150,000 |  | $ 0
Effective Interest Rate |  | 3.96% |  | 3.96% |  |
[1] | The interest rate at June 30, 2018 also reflects the interest rate protection agreements we entered into to effectively convert the variable rate to a fixed rate. See Note 10.

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