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Discontinued Operations - Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Discontinued Operations          
Available-for-sale unrealized gains $ 30,685   $ 30,685   $ 12,702
Unrealized net (losses) gains from equity securities     100   100
Discontinued Operations, Disposed of by sale | NLC          
Discontinued Operations          
Available-for-sale unrealized gains         2,500
Unrealized net (losses) gains from equity securities         $ 1,100
Recognized net gain (loss) on equity securities $ 1,900 $ 200 $ (2,500) $ 1,400