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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 18,179 $ 22,305 $ 58,625 $ 71,645
Depletion expense 684 545 1,069 638
Amortization expense 249 253 756 761
Accretion expense 36 29 109 86
Depreciation, depletion, amortization and accretion $ 19,148 $ 23,132 $ 60,559 $ 73,130