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Real Estate Investments (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2004 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Real Estate Properties [Line Items] |  |  |  |
Deferred Revenue |  | $ 1,823 | $ 1,708 |
Operating Leases, Rent Expense |  | 653 | 606 | $ 471
Impairment of Real Estate |  | 0 | 0 | 3,020
Proceeds from Sale of Real Estate |  | 29,700 | 29,000 | 12,900
Gains (Losses) on Sales of Investment Real Estate |  | $ 10,000 | 12,100 | 400
Real Estate Portfolio Leased Intangible Assets Percentage |  | 99.60% |  |
Real Estate Portfolio Leased Intangible Assets Weighted Average Remaining Lease Term |  | 10 years 7 months 6 days |  |
Four Development And PCS Projects [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Property Subject to or Available for Operating Lease, Gross |  | $ 21,700 |  |
Fourteen Development And PCS Projects [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Property Subject to or Available for Operating Lease, Gross |  | 38,000 |  |
Corporate Joint Venture [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Deferred Revenue, Additions | $ 4,000 |  |  |
Deferred Revenue | 4,000 |  |  |
Deferred Revenue, Refund Payments | $ 4,000 |  |  |
Petoskey Town Center [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of Real Estate |  |  |  | 200
Chippewa Commons [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of Real Estate |  |  |  | $ 2,800
Seventy Three Retail Net Lease Assets [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  | $ 220,600 |
Weighted Average Capitalization Rate For Acquired Assets (In Percentage) |  |  | 8.00% |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) |  |  | 12 years 2 months 12 days |
Percentage Of Control Of Assets (in Percentage) |  |  | 100.00% |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land |  |  | $ 33,800 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings |  |  | 152,800 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | $ 34,000 |
Eighty Two Retail Net Lease Assets [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  | $ 295,600 |  |
Weighted Average Capitalization Rate For Acquired Assets (In Percentage) |  | 7.80% |  |
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 |  |
Operating Leases, Future Minimum Payments Receivable [Member] | Walgreens [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 11.60% |  |

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