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Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Line Items] |  |  |  |  |
Number of Reportable Segments |  |  | 1 |  |
Cash in Excess of FDIC Insured Amounts |  |  | $ 52,700 | $ 57,500 |
Deferred Rent Receivables, Net |  |  | $ 16,700 | 12,900 |
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements |  |  | 261,731 |  |
Proceeds From Issuance Of Common Stock |  |  | $ 339,744 | 222,695 | $ 228,011
Percentage Of Leases On Total Assets |  |  | 1.00% |  |
March 2018 Forward Sale [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  | 3,450,000 |  |  |
Forward Contract Indexed to Issuer's Equity, Additional Shares |  | 450,000 |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share |  | $ 48.00 |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Date | Sep. 30, 2018 |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements |  |  | 198,786 |  |
Proceeds From Issuance Of Common Stock | $ 160,200 |  |  |  |
September 2018 Forward Sales [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares | 3,500,000 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ 55.20 |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Date | Sep. 03, 2019 |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements |  |  | 62,945 |  |
Unbilled Revenues [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Accounts Receivable, Gross |  |  | $ 3,300 | $ 1,400 |
Maximum [Member] | September 2018 Forward Sales [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Date | Sep. 03, 2019 |  |  |  |
Building [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 40 years |  |
Building Improvements [Member] | Minimum [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |  |
Building Improvements [Member] | Maximum [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 20 years |  |
General Partner [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Percentage of Operating Partnership Owned |  |  | 99.10% | 98.80% |

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