Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment - Schedule of Depreciation, Amortization, Accretion, and Depletion (Details)

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Property, Plant and Equipment - Schedule of Depreciation, Amortization, Accretion, and Depletion (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 19,590 $ 23,740 $ 40,446 $ 49,340
Depletion expense 385 93 385 93
Amortization expense 253 254 507 507
Accretion expense 37 29 73 58
Depreciation, depletion, amortization and accretion $ 20,265 $ 24,116 $ 41,411 $ 49,998