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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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