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Mepco Sale (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
May 01, 2017
Asset Purchase Agreement [Abstract]        
Commercial loans $ 1,112,101   $ 853,260  
Cash proceeds from sale of assets $ 0 $ 33,446    
Mepco [Member]        
Asset Purchase Agreement [Abstract]        
Net payment plan receivables       $ 33,100
Commercial loans       500
Furniture and Equipment       200
Other assets       1,600
Liabilities assumed       $ 2,000
Cash proceeds from sale of assets     33,400  
Gain (loss) on sale of assets     $ 0