Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Property, Plant and Equipment - Schedule of Depreciation, Amortization, Accretion, and Depletion (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 22,305 $ 28,123 $ 71,645 $ 84,288
Depletion expense 545 1,339 638 3,285
Amortization expense 253 277 761 844
Accretion expense 29 52 86 95
Depreciation, depletion, amortization and accretion $ 23,132 $ 29,791 $ 73,130 $ 88,512