Amount of assets pledged to secure a debt instrument.

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Indebtedness - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Loss from Retirement of Debt	$ (1,653)	$ 0
Mortgage Loans Payable
Debt Instrument [Line Items]
Unamortized deferred financing costs	2,481		$ 2,905
Extinguishment of debt, amount	36,108
Loss from Retirement of Debt	1,653
Net carrying value of industrial properties collateralized by mortgage loans	594,627
Senior Unsecured Notes
Debt Instrument [Line Items]
Unamortized deferred financing costs	277		320
Unsecured Term Loan
Debt Instrument [Line Items]
Unamortized deferred financing costs	3,196		3,362
Unsecured Credit Facility
Debt Instrument [Line Items]
Unamortized deferred financing costs	$ 2,544		$ 2,876