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Debt - Narrative (Details)				12 Months Ended
	Dec. 21, 2018 USD ($) tranche option	Jul. 12, 2018 USD ($)	Feb. 03, 2015 USD ($) option	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Nov. 05, 2015 USD ($)
Mortgages Payable [Line Items]
Debt, net				$ 561,782,000	$ 667,861,000
Wells Fargo, Merrill Lynch, Pierce Fenner Smith, PNC Capital Markets Credit Facility
Mortgages Payable [Line Items]
Maximum borrowing capacity						$ 300,000,000
Maximum borrowing capacity with accordion feature						$ 600,000,000
Interest Rate Swap | Level 2
Mortgages Payable [Line Items]
Notional amount				150,000,000
Mortgages
Mortgages Payable [Line Items]
Long-term debt, net				$ 212,927,000	$ 369,476,000
Mortgages | Minimum
Mortgages Payable [Line Items]
Stated interest rate (percent)				3.49%	3.49%
Mortgages | Maximum
Mortgages Payable [Line Items]
Stated interest rate (percent)				5.49%	10.45%
Line of Credit | Term Loan
Mortgages Payable [Line Items]
Long-term debt, net				$ 348,855,000
Unsecured Debt | Term Loan
Mortgages Payable [Line Items]
Debt instrument, face amount	$ 400,000,000
Number of Tranches | tranche	2
Leverage ratio, fee percentage				0.15%
Unsecured Debt | Term Loan | Minimum
Mortgages Payable [Line Items]
Leverage ratio, fee percentage	0.15%
Unsecured Debt | Term Loan | Maximum
Mortgages Payable [Line Items]
Leverage ratio, fee percentage	0.25%
Unsecured Debt | Term Loan, Tranche One
Mortgages Payable [Line Items]
Debt instrument, face amount	$ 250,000,000
Debt instrument, term	5 years			5 years
Proceeds from borrowings	$ 226,000,000
Additional amount drawn	$ 26,000,000
Remaining borrowing capacity				$ 24,000,000
Unsecured Debt | Term Loan, Tranche One | London Interbank Offered Rate (LIBOR)
Mortgages Payable [Line Items]
Basis spread on variable rate	1.20%
Unsecured Debt | Term Loan, Tranche Two
Mortgages Payable [Line Items]
Debt instrument, face amount	$ 150,000,000
Debt instrument, term	5 years 6 months			5 years 6 months
Proceeds from borrowings	$ 126,000,000
Additional amount drawn	$ 26,000
Remaining borrowing capacity				$ 24,000,000
Unsecured Debt | Term Loan, Tranche Two | London Interbank Offered Rate (LIBOR)
Mortgages Payable [Line Items]
Basis spread on variable rate	1.20%
Revolving Credit Facility
Mortgages Payable [Line Items]
Additional amount drawn		$ 52,000
Pay off of outstanding unsecured revolving line of credit	$ 52,000,000
Revolving Credit Facility | KeyBanc Capital Markets and J.P. Morgan Securities LLC Amended and Restated
Mortgages Payable [Line Items]
Basis spread on variable rate			1.40%
Maximum borrowing capacity			$ 300,000,000
Maximum borrowing capacity with accordion feature			$ 600,000,000
Number of extension options | option			1
Extension option, period			12 months
Commitment fee percentage			0.15%
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated
Mortgages Payable [Line Items]
Debt instrument, term	4 years
Leverage ratio, fee percentage				0.15%
Maximum borrowing capacity	$ 350,000,000
Remaining borrowing capacity				$ 350,000,000
Number of extension options | option	2
Extension option, period	6 months
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated | London Interbank Offered Rate (LIBOR)
Mortgages Payable [Line Items]
Basis spread on variable rate				1.05%
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated | Minimum
Mortgages Payable [Line Items]
Commitment fee percentage				0.15%
Revolving Credit Facility | Revolving Credit Facility, Amended and Restated | Maximum
Mortgages Payable [Line Items]
Commitment fee percentage				0.30%

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Publisher SEC
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