Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2014

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:

	2014			2013
	(In thousands)
Balance at beginning of year	$	98,529		$	102,545
Liabilities incurred	5,416			5,610
Liabilities acquired	1,414			—
Liabilities settled	(18,388		)	(22,257		)
Accretion expense	4,605			4,574
Revisions in estimates	884			7,671
Other	379			386
Balance at end of year	$	92,839		$	98,529