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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting Policies [Line Items] |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 98.80% | 98.70% |
Deferred Rent Receivables, Net | $ 12,900 | $ 9,600 |
Reimbursement Revenue | 1,400 | 1,100 |
Proceeds from Sale of Real Estate | 44,300 | 27,900 | $ 28,100
Gain (Loss) on Disposition of Assets for Financial Service Operations | 14,193 | 9,964 | $ 12,135
Cash in Excess of FDIC Insured Amounts | $ 57,500 | $ 32,400 |
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 |  |

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