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Investments - Equity Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Equity Securities          
Investments - equity securities $ 37,074   $ 37,074   $ 36,132
Unrealized (loss) gain on investments, net (1,439) $ (89) (1,305) $ 641  
Preferred stock          
Equity Securities          
Investments - equity securities 35,200   35,200   $ 36,100
Common Stock          
Equity Securities          
Investments - equity securities $ 1,900   $ 1,900