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
Mar. 31, 2020
Mar. 31, 2019
Property, Plant and Equipment [Abstract]    
Depreciation expense $ 25,600 $ 28,066
Depletion expense 0 212
Amortization expense 253 284
Accretion expense 29 14
Depreciation, depletion, amortization and accretion $ 25,882 $ 28,576