Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financial liabilities:
Mortgages payable, net	$ 274,267	$ 287,068
Unsecured notes payable, net	696,055	695,748
Unsecured term loans, net	447,583	547,270
Unsecured revolving line of credit	126,000	216,000
Carrying Value
Financial assets:
Derivative asset	4,699	1,086
Financial liabilities:
Mortgages payable, net	274,267	287,068
Unsecured notes payable, net	696,055	695,748
Unsecured term loans, net	447,583	547,270
Unsecured revolving line of credit	126,000	216,000
Fair Value
Financial assets:
Derivative asset	4,699	1,086
Financial liabilities:
Mortgages payable, net	279,680	298,635
Unsecured notes payable, net	670,042	693,823
Unsecured term loans, net	455,242	552,555
Unsecured revolving line of credit	$ 126,000	$ 216,222

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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