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Investments Marketable Equity Securities Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Marketable Equity Securities Gains (Losses) [Abstract]        
Marketable equity securities gains, net $ 11,654 $ 64,570 $ 27,665 $ 13,162
Less net gains recognized on marketable equity securities sold 0 36,993 263 37,316
Unrealized gains (losses) recognized on marketable equity securities held $ 11,654 $ 27,577 $ 27,402 $ (24,154)