Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2021

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Six Months Ended June 30,
	2021			2020
	(in thousands)
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities	$	—		$	2,154
Interest paid		(87,337	)		(78,265	)
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized		2,098			4,247
Increase (decrease) in accrued capital expenditures		3,185			(31,307	)