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v3.19.1

Subsequent Events (Textual) (Details) | Apr. 12, 2019 USD ($) | Apr. 11, 2019 USD ($) property | Apr. 01, 2019 USD ($) | Mar. 29, 2019 USD ($) property | Mar. 31, 2019 property
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Subsequent Event [Line Items] |  |  |  |  |
Number of properties used to secure debt | property |  |  |  |  | 96
Herndon Innovation Center Metro Portfolio Venture, LLC [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Ownership percentage |  |  |  | 15.00% |
Herndon Innovation Center Metro Portfolio Venture, LLC [Member] | Secured Debt [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Indebtedness to third parties, refinanced amount |  |  |  | $ 134,100,000 |
Number of properties used to secure debt | property |  |  |  | 4 |
Debt instrument, basis spread on variable rate |  |  |  | 1.95% |
Cash proceeds from financing |  |  | $ 111,000.0 | $ 113,100 |
Subsequent Event [Member] | Herndon Innovation Center Metro Portfolio Venture, LLC [Member] | Secured Debt [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Ownership percentage |  | 15.00% |  |  |
Indebtedness to third parties, refinanced amount |  | $ 115,300,000 |  |  |
Number of properties used to secure debt | property |  | 4 |  |  |
Debt instrument, basis spread on variable rate |  | 1.80% |  |  |
Debt Instrument, maturity date |  | Apr. 11, 2024 |  |  |
Cash proceeds from financing | $ 13,800,000 |  |  |  |
Subsequent Event [Member] | Herndon Innovation Center Metro Portfolio Venture, LLC [Member] | Secured Debt [Member] | Maximum [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Debt Instrument, interest rate, stated percentage |  | 6.30% |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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