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Real Estate Investments (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) ft² | Sep. 30, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) ft²
Real Estate Properties [Line Items] |  |  |
Property Subject to or Available for Operating Lease, Gross | $ 59,600 | $ 59,600 |
Number of Real Estate Properties | 520 | 520 | 436
Land Subject to Ground Leases | ft² | 10.0 | 10.0 | 8.7
Real Estate Investment Property, Net | $ 1,424,828 | $ 1,424,828 | $ 1,214,016
Impairment of Long-Lived Assets Held-for-use | 500 | 1,700 |
Gains (Losses) on Sales of Investment Real Estate | 3,900 | 9,900 |
Options Exercised [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Proceeds from Sale of Real Estate |  | 3,900 |
Gains (Losses) on Sales of Investment Real Estate |  | 1,000 |
Five Development And PCS Projects [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Property Subject to or Available for Operating Lease, Gross | 14,000 | 14,000 |
Five Real Estate Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Proceeds from Sale of Real Estate | $ 29,600 | $ 56,400 |
Seventy Nine Retail Net Lease Assets [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) | 11 years 6 months | 12 years 3 months 18 days |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land | $ 81,600 | $ 81,600 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings | 174,400 | 174,400 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 93,900 | 93,900 |
Seventy Nine Retail Net Lease Assets [Member] | Five Development And PCS Projects [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 150,000 | $ 349,900 |

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- Definition Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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