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Impairment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of Impairment by Asset Class
Impairment for the years ended December 31, 2020 and 2019 consists of the following (in thousands):
Year Ended December 31,
20202019
Full cost pool ceiling limitation$218,399 $409,574 
Other38,000 — 
$256,399 $409,574