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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2020
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 March 31, 2020
 
As of December 31, 2019
(in thousands)
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Financial Instruments:
 
 
 
 
 
 
 
 
Highview Investment
 
$
552

 
$
552

 
$
552

 
$
552

Highview Obligation
 
$
208

 
$
208

 
$
220

 
$
220