Commitments and Contingencies (Narratives) (Details) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2017 property	Mar. 31, 2016 USD ($) property	Mar. 31, 2015 USD ($)	Dec. 31, 2016 property	Jun. 30, 2016 property
Funding Commitments
Properties under renovation | property		11
Rent expense | $		$ 0.9	$ 0.8
Annual Percentage Rent
Funding Commitments
Rent expense | $		$ 0.1	$ 0.1
Forecast
Funding Commitments
Number Of construction projects expected to be completed | property	4			1	6