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Commitment and Contingencies (Details) - USD ($)
$ in Thousands
Aug. 26, 2016
Sep. 30, 2018
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]      
Repurchase obligations   $ 136,520 $ 163,626
Financing receivable   $ 333 $ 453
Loss contingency, damages sought $ 5,000