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Fair Value of Financial Instruments - Financial Instruments for which Estimates of Fair Value Differ from Carrying Amounts (Details) - USD ($)
$ in Thousands

Jun. 30, 2018

Dec. 31, 2017

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Mortgage notes payable, net

$ 324,289

$ 317,216

Carrying Amount [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Notes receivable

^[1],[2]

47,871

3,532

Carrying Amount [Member] | Unsecured Notes Payable [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Unsecured notes payable

^[1]

1,287,299

1,286,573

Carrying Amount [Member] | Variable Rate Debt [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Variable rate debt

^[1]

327,205

327,039

Carrying Amount [Member] | Mortgages Notes Payable [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Mortgage notes payable, net

^[1]

324,289

317,216

Fair Value [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Note receivable, fair value

^[2]

47,908

3,605

Fair Value [Member] | Unsecured Notes Payable [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Debt instrument, fair value

1,267,015

1,314,900

Fair Value [Member] | Variable Rate Debt [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Debt instrument, fair value

310,536

308,872

Fair Value [Member] | Mortgages Notes Payable [Member]

Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]

Debt instrument, fair value

$ 307,615

$ 304,665

[1]	The carrying amounts presented in the table above are net of deferred financing costs of $8.4 million and $8.9 million for unsecured notes payable, $1.4 million and $1.6 million for variable rate debt and $0.5 million and $0.6 million for mortgage notes payable as of June 30, 2018 and December 31, 2017, respectively.
[2]	The inputs to originate the notes receivable are unobservable and, as a result, are categorized as Level 3. The Company determined fair value by calculating the present value of the cash payments to be received through the maturity date of the loans.

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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