Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2015

Asset Retirement Obligation [Abstract]

Reconciliation of the company's asset retirement obligation

A reconciliation of the Company's liability, which is included in other accrued liabilities and other liabilities on the Consolidated Balance Sheets, for the years ended December 31 was as follows:

	2015			2014
	(In thousands)
Balance at beginning of year	$	27,211		$	27,327
Liabilities incurred	2,751			1,697
Liabilities settled	(1,708		)	(3,231		)
Accretion expense	1,163			1,112
Revisions in estimates	211,836			(73		)
Other	971			379
Balance at end of year	$	242,224		$	27,211