Debt - Summary of Debt (Details)			3 Months Ended
Mar. 31, 2016 USD ($) properties	Dec. 31, 2015 USD ($) properties	Mar. 31, 2016 USD ($) properties
Debt
Notes payable	$ 114,886,000	$ 93,926,000	$ 114,886,000
Unsecured Debt	115,789,000	389,375,000	115,789,000
Total principal	385,886,000	488,926,000	385,886,000
Unamortized deferred financing cost	(6,345,000)	(5,985,000)	(6,345,000)
Unamortized fair value adjustment	615,000	674,000	615,000
Total debt	380,156,000	483,615,000	380,156,000
Mortgage notes, bearing fixed interest from 4.71% to 6.58%
Debt
Notes payable	$ 89,157,000	$ 89,664,000	$ 89,157,000
Weighted average interest rate (as a percent)	5.40%	5.40%	5.40%
Number of properties included in collateralized \| properties	11	11	11
Net book value of properties included in the collateralized	$ 143,725,000	$ 145,038,000	$ 143,725,000
Mortgage notes, bearing fixed interest from 4.71% to 6.58% \| Minimum
Debt
Interest rate (as a percent)	4.71%	4.71%	4.71%
Mortgage notes, bearing fixed interest from 4.71% to 6.58% \| Maximum
Debt
Interest rate (as a percent)	6.58%	6.58%	6.58%
Mortgage notes, bearing variable interest due in 2017 and 2018
Debt
Notes payable	$ 25,729,000		$ 25,729,000
Number of properties included in collateralized \| properties	3		3
Net book value of properties included in the collateralized	$ 38,766,000		$ 38,766,000
Mortgage notes, bearing variable interest due in 2017 and 2018 \| Minimum \| LIBOR
Debt
Reference rate (as a percent)	2.75%
Mortgage notes, bearing variable interest due in 2017 and 2018 \| Maximum \| LIBOR
Debt
Reference rate (as a percent)	3.25%
Mortgage note, bearing variable interest of LIBOR plus 2.75%
Debt
Notes payable		$ 4,262,000
Number of properties included in collateralized \| properties		1
Net book value of properties included in the collateralized		$ 5,994,000
Mortgage note, bearing variable interest of LIBOR plus 2.75% \| Minimum \| LIBOR
Debt
Reference rate (as a percent)		2.75%
Mortgage note, bearing variable interest of LIBOR plus 2.75% \| Maximum \| LIBOR
Debt
Reference rate (as a percent)		2.75%
Credit agreement
Debt
Unsecured Debt	$ 121,000,000	$ 395,000,000	121,000,000
Maximum borrowing capacity	$ 750,000,000	$ 750,000,000	$ 750,000,000
Credit agreement \| LIBOR
Debt
Reference rate (as a percent)	1.20%	1.20%	1.20%
Senior notes
Debt
Notes payable	$ 150,000,000	$ 0	$ 150,000,000

Represents the unamortized amount of debt fair value adjustments.

No definition available.

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- Definition

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments. Also includes deferred charges for lease commissions (net of accumulated amortization).

+ References

No definition available.

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- Definition

The number of properties, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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- Definition

Weighted average interest rate of long-term debt outstanding.

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- Definition

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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- Definition

The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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- Definition

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

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