Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Nine Months Ended September 30,
	2018			2017
	(in thousands)
Net cash provided from operating activities included:
Income taxes refunded (paid) to taxing authorities	$	7,521		$	(98	)
Interest paid		(161,444	)		(136,863	)
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized		20,452			6,460
(Decrease) increase in accrued capital expenditures		(107,070	)		52,289