Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2019

Supplemental Cash Flow Information [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information

	Year Ended December 31,
In thousands	2019			2018		2017
Supplemental cash flow information
Cash paid for interest, expensed	$	72,842		$	50,076	$	98,261
Cash paid for interest, capitalized	36,671			37,079		30,762
Cash paid for interest, treated as a reduction of debt	85,303			79,606		50,349
Cash paid for income taxes	2,361			492		450
Cash received from income tax refunds	9,820			8,280		13,323
Noncash investing and financing activities
Increase in asset retirement obligations	13,560			4,499		9,565
Increase (decrease) in liabilities for capital expenditures	(17,740		)	14,600		3,930
Conversion of convertible senior notes into common stock	—			162,004		—
Retirement of treasury stock	—			—		46,562