Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2015

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Three Months Ended March 31,
	2015			2014
	(in thousands)
Net cash provided from operating activities included:
Income taxes paid to taxing authorities	$	—		$	39
Interest paid		54,284			55,190
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized		15,813			3,218
(Decrease) increase in accrued capital expenditures		(110,622	)		6,808