Investments in Marketable Securities and Unconsolidated Entities - Income (Loss), Impairments From, and Equity In Investments In Unconsolidated Entities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Equity in income (loss) of unconsolidated entities	$ (51)	$ 82	$ 9	$ 224