Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2012

Asset Retirement Obligations (Tables) [Abstract]

Change in Asset Retirement Obligations

(In thousands)		2012		2011
Balance at January 1,	$	19,173	$	19,913
Liabilities incurred		49		85
Accretion expense		1,021		1,071
Liabilities settled		(221)		(157)
Revisions in estimated cash flows(a)		(1,254)		(1,739)
Balance at December 31,	$	18,768	$	19,173