Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Supplemental Cash Flow Information) (Details)

v3.20.4
Summary of Significant Accounting Policies (Supplemental Cash Flow Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplemental cash flow information:      
Interest paid, net of capitalized amounts $ 91,269,000 $ 0 $ 0
Income taxes paid 0 0 0
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases 44,314,000 3,414,000 0
Investing cash flows from operating leases 24,234,000 32,529,000 0
Non-cash investing and financing activities:      
Change in accrued capital expenditures (64,465,000) (31,475,000) (52,757,000)
Change in asset retirement costs 8,605,000 13,559,000 8,730,000
Contingent consideration arrangement 0 8,512,000 0
ROU assets obtained in exchange for lease liabilities:      
Operating leases 8,070,000 66,914,000 0
Financing leases 0 2,197,000 0
Federal      
Supplemental cash flow information:      
Income taxes paid $ 0 $ 0 $ 0