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Investments (Gain (Loss) on Marketable Equity Securities) (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investments [Abstract]        
Gain (loss) on marketable equity securities, net $ 7,791 $ (2,554) $ 31,857 $ (16,656)
Less: Net (gains) losses in earnings from marketable equity securities sold and donated 2 1,660 (2,980) 4,271
Net unrealized gains (losses) in earnings from marketable equity securities still held at the end of the period $ 7,793 $ (894) $ 28,877 $ (12,385)