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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Schedule of Estimated Fair Values of Remaining Financial Instruments The following table provides the estimated fair values of the remaining financial instruments:
As of June 30, 2021As of December 31, 2020
(in thousands)Carrying ValueFair ValueCarrying ValueFair Value
Financial Instruments:
Highview Investment$552 $552 $552 $552 
Highview Obligation$233 $233 $228 $228