Equity Investments - Northstar Illinois (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Aug. 31, 2015	Jun. 30, 2015
Northstar IL
Schedule of Equity Method Investments [Line Items]
Shortfall payment	$ 10.0	$ 35.1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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