Rental Property Rental Property - Involuntary Conversion (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Loss Contingencies [Line Items]
Partial disposal of building due to involuntary conversion of building		$ 363	$ 492
Storm Damage [Member]
Loss Contingencies [Line Items]
Partial disposal of building due to involuntary conversion of building	$ 0	800
Cumulative Partial Disposal of Building Due to Involuntary Conversion	1,500	1,500
Loss Contingency, Loss in Period	0	300
Insurance Settlements Receivable, Current	$ 500	$ 500