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