Quarterly report pursuant to Section 13 or 15(d)

Supplemental Cash Flow (Details)

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Supplemental Cash Flow (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Supplemental cash flow information:    
Interest paid, net of capitalized amounts $ 12,983 $ 15,820
Income taxes paid 0 0
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 8,065 11,821
Investing cash flows from operating leases 6,005 5,716
Non-cash investing and financing activities:    
Change in accrued capital expenditures 18,903 84,594
Change in asset retirement costs 1,151 905
ROU assets obtained in exchange for lease liabilities:    
Operating leases $ 6,476 $ 8,366