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Significant Accounting Policies (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment item	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Significant Accounting Policies Statement [Line Items]
Impairment charges	$ 0	$ 0	$ 0	$ 0
Amortization of above and below-market leases	900,000	500,000	$ 1,800,000	800,000
Remaining weighted average lease term related to these intangible assets and liabilities			8 years 10 months 24 days
Straight-line rent and accounts receivables, net of allowances	24,100,000		$ 24,100,000		$ 23,000,000
Straight-line rent and accounts receivable, allowances	300,000		300,000		100,000
Deferred financing cost accumulated amortization	6,300,000		6,300,000		5,700,000
Unrecognized Tax Benefits	0		$ 0		0
Performance measurment period			3 years
Number of interest rate cap transactions | item			3
Term loan notional amount associated with interest rate cap derivative	150,000,000		$ 150,000,000
Interest rate cap notional value	150,000,000		150,000,000
Interest rate cap fair value	100,000		$ 100,000		$ 30,000
Real Estate Investment [Member]
Significant Accounting Policies Statement [Line Items]
Number of reportable segments | segment			1
Senior Secured Loan [Member]
Significant Accounting Policies Statement [Line Items]
Impairment charges	0	$ 0	$ 0	$ 0
Interest Rate Cap [Member]
Significant Accounting Policies Statement [Line Items]
Number of interest rate cap transactions | item			3
Term loan notional amount associated with interest rate cap derivative	150,000,000		$ 150,000,000
Interest rate cap notional value	$ 150,000,000		$ 150,000,000
Derivative cap interest rate	4.00%		4.00%
Interest Rate Cap, Maturity Date May 1, 2021 [Member] | January 2022 Term Loan [Member]
Significant Accounting Policies Statement [Line Items]
Term loan notional amount associated with interest rate cap derivative	$ 50,000,000		$ 50,000,000
Effective Date			Dec. 01, 2014
Maturity date			May 01, 2021
Derivative cap interest rate	4.00%		4.00%
Interest Rate Cap, Maturity Date April 1, 2019 [Member] | August 2021 Term Loan [Member]
Significant Accounting Policies Statement [Line Items]
Term loan notional amount associated with interest rate cap derivative	$ 50,000,000		$ 50,000,000
Effective Date			Sep. 01, 2015
Maturity date			Apr. 01, 2019
Derivative cap interest rate	4.00%		4.00%
Interest Rate Cap, Maturity Date February 3, 2020 [Member] | January 2022 Term Loan [Member]
Significant Accounting Policies Statement [Line Items]
Term loan notional amount associated with interest rate cap derivative	$ 50,000,000		$ 50,000,000
Effective Date			Sep. 01, 2015
Maturity date			Feb. 03, 2020
Derivative cap interest rate	4.00%		4.00%
Minimum [Member[ | Interest Rate Cap [Member]
Significant Accounting Policies Statement [Line Items]
Derivative, Range of Basis Spread on Variable Rate	1.30%		1.30%
Maximum [Member] | Interest Rate Cap [Member]
Significant Accounting Policies Statement [Line Items]
Derivative, Range of Basis Spread on Variable Rate	1.85%		1.85%

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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-Name Accounting Standards Codification
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Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

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