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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, 2018 USD ($) ft² Property | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 31, 2017 USD ($) | Mar. 10, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss from Retirement of Debt |  |  |  | $ (39) | $ (1,775) | $ 0 |  |
Long-term Debt, Gross |  |  |  | $ 1,306,181 |  |  |  |
2028 Private Placement Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 3.86% |  |  |  |
Long-term Debt, Gross |  |  |  | $ 150,000 | 0 |  |  |
Effective Interest Rate |  |  |  | 3.86% |  |  |  |
2030 Private Placement Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 3.96% |  |  |  |
Long-term Debt, Gross |  |  |  | $ 150,000 | 0 |  |  |
Effective Interest Rate |  |  |  | 3.96% |  |  |  |
2027 Private Placement Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 4.30% |  |  |  |
Long-term Debt, Gross |  |  |  | $ 125,000 | $ 125,000 |  |  |
Effective Interest Rate |  |  |  | 4.30% | 4.30% |  |  |
2029 Private Placement Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 4.40% |  |  |  |
Long-term Debt, Gross |  |  |  | $ 75,000 | $ 75,000 |  |  |
Effective Interest Rate |  |  |  | 4.40% | 4.40% |  |  |
2017 II Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  | $ 101,871 |  |  |
2017 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  | 54,981 |  |  |
2014 Unsecured Term Loan (A) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Change Due to Investment Grade Rating |  |  |  | 10 basis point |  |  |  |
Loss from Retirement of Debt |  |  |  |  | 51 |  |  |
Interest Rate | [1] |  |  | 3.39% |  |  |  |
Debt Instrument, term |  |  | 7 years |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 200,000 | 200,000 |  |  |
Unsecured term loan, face amount |  |  | $ 200,000 |  |  |  |  |
Debt instrument, interest rate terms |  |  |  | LIBOR plus 110 basis points |  |  |  |
2015 Unsecured Term Loan (A) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate | [1] |  |  | 2.89% |  |  |  |
Debt Instrument, term |  | 7 years |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 260,000 | 260,000 |  |  |
Unsecured term loan, face amount |  | $ 260,000 |  |  |  |  |  |
Debt instrument, interest rate terms |  |  |  | LIBOR plus 110 basis points |  |  |  |
Mortgage Loans Payable |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  | $ 1,246 | 1,806 |  |  |
Extinguishment of debt, amount |  |  |  | 157,782 | 36,108 |  |  |
Loss from Retirement of Debt |  |  |  | 39 | 1,653 |  |  |
Net carrying value of industrial properties collateralized by mortgage loans |  |  |  | 459,225 |  |  |  |
Long-term Debt, Gross |  |  |  | 297,610 | 451,602 |  |  |
Mortgage Loans Payable | Assumed Mortgage |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Assumed mortgage loan |  |  |  | $ 11,654 |  |  |  |
Number of industrial properties acquired | Property |  |  |  | 3 |  |  |  |
Gross leasable area (GLA) of industrial properties acquired | ft² |  |  |  | 0.2 |  |  |  |
Interest Rate |  |  |  | 4.17% |  |  |  |
Debt Instrument, term |  |  |  | 30 years |  |  |  |
Unsecured Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  | $ 3,554 | 4,781 |  |  |
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 |  |  |  |
[1] | See Note 12.

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