Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2012

Asset Retirement Obligation [Abstract]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

	(In thousands)		Years Ended December 31,
			2012		2011
Beginning balance		$	51,295	$	52,099
	Adjustment due to change in estimate of related costs		3,570		(3,174)
	Accretion of liability		4,920		5,001
	Liabilities settled		(2,936)		(2,631)
Ending balance		$	56,849	$	51,295