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Marketable Securities - Reconciliation of Marketable Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financial Instruments [Abstract]    
Balance – beginning of year $ 3,120 $ 988
Additions 228 514
Reclassification of investment in Solaris 135,964 0
Change in fair value 101,218 1,618
Balance – end of year $ 240,530 $ 3,120