Investments in Unconsolidated Entities - Outstanding Borrowings of Unconsolidated Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	$ 5,065	$ 10,470
Unconsolidated Entities
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	5,065	10,470
Total equity of unconsolidated entities	14,585	31,615
Total outstanding borrowings of unconsolidated entities	$ 17,725	$ 14,702