Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial liabilities:
Mortgages payable, net	$ 92,967	$ 94,155
Unsecured notes payable, net	796,568	796,247
Unsecured term loans, net	716,992	716,523
Unsecured revolving line of credit	135,000	18,000
Carrying Value
Financial liabilities:
Mortgages payable, net	92,967	94,155
Unsecured notes payable, net	796,568	796,247
Unsecured term loans, net	716,992	716,523
Unsecured revolving line of credit	135,000	18,000
Derivative liability	39,176	12,288
Fair Value
Financial liabilities:
Mortgages payable, net	94,982	98,082
Unsecured notes payable, net	786,719	822,883
Unsecured term loans, net	704,148	720,000
Unsecured revolving line of credit	133,299	18,000
Derivative liability	$ 39,176	$ 12,288

- 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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