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Real Estate Investments (Details Textual) $ in Thousands, ft² in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2014 USD ($) | Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($) ft² | Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |
Deferred Revenue |  | $ 1,837 | $ 1,823 |
Operating Leases, Rent Expense |  | 653 | 653 | $ 606
Proceeds from Sale of Real Estate |  | 44,300 | 27,900 | 28,100
Gains (Losses) on Sales of Investment Real Estate |  | $ 14,200 | $ 10,000 | $ 12,100
Number of Real Estate Properties |  | 436 | 366 |
Land Subject to Ground Leases | ft² |  | 8.7 | 7.0 |
Real Estate Investment Property, Net, Total |  | $ 1,214,016 | $ 950,261 |
Five Development And PCS Projects [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Property Subject to or Available for Operating Lease, Gross |  | 41,300 |  |
Nine Development And PCS Projects [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Property Subject to or Available for Operating Lease, Gross |  | 62,700 |  |
Eighty Two Retail Net Lease Assets [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  | $ 295,600 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) |  |  | 10 years 8 months 12 days |
Percentage Of Control Of Assets (in Percentage) |  |  | 100.00% |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land |  |  | $ 84,300 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings |  |  | 170,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | $ 41,300 |
Seventy Nine Retail Net Lease Assets [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  | $ 338,000 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) |  | 11 years 1 month 6 days |  |
Percentage Of Control Of Assets (in Percentage) |  | 100.00% |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land |  | $ 94,100 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings |  | 172,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 71,900 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt |  | $ 21,500 |  |
Corporate Joint Venture [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Deferred Revenue, Additions | $ 4,000 |  |  |
Deferred Revenue | 4,000 |  |  |
Deferred Revenue, Refund Payments | $ 4,000 |  |  |
Operating Leases, Future Minimum Payments Receivable [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 6.50% |  |

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