Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2019

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Three Months  Ended  March 31,
	2019			2018
	(in thousands)
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities	$	—		$	7,518
Interest paid		(54,632	)		(57,536	)
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized		1,532			5,063
Increase (decrease) in accrued capital expenditures		22,764			(77,365	)