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Asset Retirement Obligations (AROs) (Tables)
12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
A reconciliation of the carrying amounts of AROs for the years ended December 31, 2020 and 2019 is as follows: 
(in thousands)20202019
Beginning Balance$12,656 $9,117 
New Obligations Recognized8,062 — 
Adjustments Due to Revisions in Cash Flow Estimates3,110 3,099 
Accrued Accretion570 440 
Settlements(577)— 
Ending Balance$23,821 $12,656