Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2020

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Year Ended December 31,
	2020			2019			2018
	(in thousands)
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities	$	343		$	—		$	7,521
Interest paid		(168,471	)		(189,443	)		(207,433	)
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$	2,610		$	11,193		$	28,826
Decrease in accrued capital expenditures		(23,625	)		(20,104	)		(119,021	)