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Subsequent Event (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Subsequent Event [Line Items]      
Gain (Loss) on Disposition of Assets   $ 4,064,000 $ 103,821,000
Variable Interest Entity, Not Primary Beneficiary [Member]      
Subsequent Event [Line Items]      
Proceeds from Divestiture of Businesses and Interests in Affiliates   11,049,000  
Gain (Loss) on Disposition of Assets   $ 2,030,000  
Variable Interest Entity, Not Primary Beneficiary [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Proceeds from Divestiture of Businesses and Interests in Affiliates $ 19,226,000    
Gain (Loss) on Disposition of Assets $ 14,400,000