Investments (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Apr. 30, 2020 |
Dec. 31, 2019 |
|
Schedule of Investments [Line Items] | |||||
Equity method investments | $ 68,200 | $ 68,200 | $ 69,100 | ||
Investments in marketable equity securities | 43,300 | 43,300 | 4,400 | ||
Unrealized gain on marketable securities | 15,000 | 14,000 | |||
Investments in non-marketable equity securities | $ 16,800 | 16,800 | $ 61,800 | ||
Write-down of non-marketable equity securities and note receivable | $ 20,000 | $ 17,741 | |||
Reclassified from Non-marketable Security to Marketable Security | |||||
Schedule of Investments [Line Items] | |||||
Investments in marketable equity securities | $ 25,000 |