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Commitments and Contingencies (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Loss Contingencies [Line Items]            
Legal Fees $ 650,000 $ 2,800,000 $ 1,800,000      
Lease expense under operating leases       $ 3,100,000 $ 2,600,000 $ 2,500,000
Other Investors            
Loss Contingencies [Line Items]            
Recourse liability       200,000    
Mortgage Partnership Finance (MPF) Program            
Loss Contingencies [Line Items]            
Recourse liability     $ 105,000 $ 83,000 $ 105,000