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Indebtedness - Additional Information (Details) $ in Thousands, ft² in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 11, 2015 USD ($) | Jan. 29, 2014 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) ft² Property | Dec. 31, 2015 USD ($) | Feb. 22, 2018 USD ($) | Oct. 31, 2017 USD ($) | Mar. 10, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss from Retirement of Debt |  |  |  | $ (1,775) | $ 0 | $ 0 |  |  |
2027 Private Placement Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Assumed mortgage, fixed interest rate |  |  |  | 4.30% |  |  |  |  |
Senior Unsecured Notes, Gross |  |  |  | $ 125,000 | 0 |  |  |  |
Effective Interest Rate |  |  |  | 4.30% |  |  |  |  |
2029 Private Placement Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Assumed mortgage, fixed interest rate |  |  |  | 4.40% |  |  |  |  |
Senior Unsecured Notes, Gross |  |  |  | $ 75,000 | 0 |  |  |  |
Effective Interest Rate |  |  |  | 4.40% |  |  |  |  |
2017 II Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  | $ 101,871 |  |  |  |  |
Senior Unsecured Notes, Gross |  |  |  | 0 | 101,871 |  |  |  |
2017 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  | 54,981 |  |  |  |  |
Senior Unsecured Notes, Gross |  |  |  | 0 | 54,981 |  |  |  |
2014 Unsecured Term Loan (A) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss from Retirement of Debt |  |  |  | $ 51 |  |  |  |  |
Assumed mortgage, fixed interest rate | [1] |  |  | 3.49% |  |  |  |  |
Debt Instrument, term |  |  | 7 years |  |  |  |  |  |
Unsecured term loan, face amount |  |  | $ 200,000 |  |  |  |  |  |
Debt Instrument Interest Rate Change Due To Amendment |  |  |  | 50 basis points |  |  |  |  |
Debt instrument, interest rate terms |  |  |  | LIBOR plus 120 basis points |  |  |  |  |
2015 Unsecured Term Loan (A) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Assumed mortgage, fixed interest rate | [1] |  |  | 2.99% |  |  |  |  |
Debt Instrument, term |  | 7 years |  |  |  |  |  |  |
Unsecured term loan, face amount |  | $ 260,000 |  |  |  |  |  |  |
Debt Instrument Interest Rate Change Due To Amendment |  |  |  | 40 basis points |  |  |  |  |
Debt instrument, interest rate terms |  |  |  | LIBOR plus 120 basis points |  |  |  |  |
Mortgage Loans Payable |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  | $ 36,108 | 59,420 |  |  |  |
Loss from Retirement of Debt |  |  |  | 1,653 | 79 |  |  |  |
Net carrying value of industrial properties collateralized by mortgage loans |  |  |  | 576,580 |  |  |  |  |
Mortgage Loans Payable | Assumed Mortgage |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Assumed mortgage loan |  |  |  |  | $ 4,513 |  |  |  |
Number of industrial properties acquired | Property |  |  |  |  | 1 |  |  |  |
Gross leasable area (GLA) of industrial properties acquired | ft² |  |  |  |  | 0.1 |  |  |  |
Assumed mortgage, fixed interest rate |  |  |  |  | 7.35% |  |  |  |
Debt Instrument, term |  |  |  |  | 25 years |  |  |  |
Assumed mortgage, premium |  |  |  |  | $ 529 |  |  |  |
Unsecured Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss from Retirement of Debt |  |  |  | 71 |  |  |  |  |
Line of Credit Facility, current borrowing capacity |  |  |  |  |  |  |  | $ 725,000 | $ 625,000
Line of Credit Facility, additional borrowings capacity |  |  |  | $ 1,000,000 |  |  |  |  |
Number of years of extension of the Line of Credit Facility at election |  |  |  | 1 year |  |  |  |  |
Line of Credit Facility, interest rate description |  |  |  | LIBOR plus 110 basis points |  |  |  |  |
Subsequent Events | Private Placement Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior Unsecured Notes, Gross |  |  |  |  |  |  | $ 300,000 |  |
[1] | The interest rate at December 31, 2017 reflects the interest rate protection agreements we entered into to effectively convert the variable rate to a fixed rate. See Note 12.

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