Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Three Months Ended March 31,
	2017			2016
	(in thousands)
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities	$	—		$	73
Interest paid		(43,864	)		(37,117	)
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized		1,715			1,015
Increase in accrued capital expenditures		39,569			9,719