Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2020

Supplemental Cash Flow Information [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information

	Successor		Predecessor
	Period from Sept. 19, 2020 through Dec. 31, 2020		Period from Jan. 1, 2020 through Sept. 18, 2020		Year Ended December 31,
In thousands					2019		2018
Supplemental cash flow information
Cash paid for interest, expensed	$	813	$	29,357	$	72,842	$	50,076
Cash paid for interest, capitalized	1,261		22,885		36,671		37,079
Cash paid for interest, treated as a reduction of debt	—		46,417		85,303		79,606
Cash paid for income taxes	—		453		2,361		492
Cash received from income tax refunds	10,457		1,932		9,820		8,280
Noncash investing and financing activities
Increase in asset retirement obligations	23,398		4,328		13,560		4,499
Increase (decrease) in liabilities for capital expenditures	1,867		(12,809)		(17,740)		14,600
Conversion of convertible senior notes into common stock	—		11,501		—		162,004