Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2019

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Six Months  Ended  June 30,
	2019			2018
	(in thousands)
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities	$	—		$	7,521
Interest paid		(99,675	)		(103,439	)
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized		2,326			19,561
Increase (decrease) in accrued capital expenditures		6,346			(102,809	)