Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2016

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Six Months Ended June 30,
	2016			2015
	(in thousands)
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities	$	(101	)	$	—
Interest paid		69,991			73,189
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized		3,740			18,684
Decrease in accrued capital expenditures		(4,741)			(156,897	)