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Investment in Enova (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2016
shares
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Investment [Line Items]          
Change in fair value of investment in common stock of Enova International, Inc., net of tax | $   $ (1,753) [1] $ 0 $ (1,753) [1] $ 0
Loss on sale of common stock of Enova International, Inc. | $   $ (253) $ 0 $ (253) $ 0
Enova [Member]          
Investment [Line Items]          
Investment Owned, Balance, Shares | shares   5,666,000   5,666,000  
Investment Owned Percentage   17.00%   17.00%  
Investment Owned, at Cost | $   $ 57,570   $ 57,570  
Investment Owned Shares Sold | shares       317,000  
Subsequent Event [Member] | Enova [Member]          
Investment [Line Items]          
Investment Owned Shares Sold | shares 1,200,000        
Single Board [Member]          
Investment [Line Items]          
Number of Board Members       1  
Total Board [Member]          
Investment [Line Items]          
Number of Board Members       9  
[1] Net of tax benefit of $1,031 for the three and nine months ended September 30, 2016.