Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Three Months Ended March 31,
	2016			2015
	(in thousands)
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities	$	73		$	—
Interest paid		(37,117	)		(54,284	)
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized		1,015			15,813
Increase (decrease) in accrued capital expenditures		9,719			(110,622	)