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Summary of Significant Accounting Policies - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2019 USD ($) | Apr. 30, 2019 $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2018 $ / shares shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) shares | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of above and below Market Leases |  |  |  |  | $ 3,400,000 | $ 3,000,000.0 | $ 9,882,000 | $ 7,794,000 |  |
Number of Reportable Segments |  |  |  |  |  |  | 1 |  |  |
Number Of Real Estate Properties Held-For-Sale |  |  |  |  | 2 |  | 2 |  |  |
Cash in Excess of FDIC Insured Amounts |  |  |  |  | $ 9,700,000 |  | $ 9,700,000 |  |  | $ 52,700,000
Deferred Rent Receivables, Net |  |  |  |  | $ 21,300,000 |  | $ 21,300,000 |  |  | 16,700,000
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements | shares |  |  |  |  | 376,558 |  | 529,893 |  |  |
Deferred income tax liability |  |  |  |  |  |  |  |  |  | 475,000
Income tax expense |  |  |  |  | $ (184,000) | $ (125,000) | $ (210,000) | (391,000) |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  | 276,960,000 | $ 159,604,000 |  |
Right of use assets |  |  |  |  | 16,200,000 |  | 16,200,000 |  |  |
Lease liabilities |  |  |  |  | $ 16,310,000 |  | $ 16,310,000 |  |  |
ASU 2016-02 | Restatement |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Right of use assets |  |  |  |  |  |  |  |  | $ 7,500,000 |
Lease liabilities |  |  |  |  |  |  |  |  | $ 7,500,000 |
March 2018 Forward Sale [Member] |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares | shares |  |  |  | 3,450,000 |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Additional Shares | shares |  |  |  | 450,000 |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares |  |  |  | $ 48.00 |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements | shares |  |  |  |  |  | 439,761 |  | 265,048 |  |
Proceeds From Issuance Of Common Stock |  |  | $ 160,200,000 |  |  |  |  |  |  |
September 2018 Forward Sales |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares | shares |  |  | 3,500,000 |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares |  |  | $ 55.20 |  |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements | shares |  |  |  |  |  | 8,455 | 359,713 | 2,818 |  |
Proceeds From Issuance Of Common Stock | $ 186,000,000.0 |  |  |  |  |  |  |  |  |
April 2019 Forward Equity |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares | shares |  | 3,162,500 |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ / shares |  | $ 65.85 |  |  |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements | shares |  |  |  |  | 376,558 | 0 | 170,180 | 0 |  |
Unbilled Revenues |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Gross |  |  |  |  | $ 2,800,000 |  | $ 2,800,000 |  |  | $ 3,300,000

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