Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2013

Asset Retirement Obligations [Abstract]

Schedule Of Asset Retirement Obligations

	Three months ended March 31, 2013	Year ended December 31, 2012
	(in thousands)
Balance at beginning of period (including current portion)	$                            33,003	$                            34,113
Accretion expense	589	1,896
Adjustment resulting from addition of property	-	72
Adjustment resulting from disposal of property	-	(968)
Adjustments to the liability from annual recosting and other	-	(201)
Liabilities settled	(341)	(1,909)
Balance at end of period	33,251	33,003
Current portion of asset retirement obligation	2,438	2,255
Long-term portion of asset retirement obligation	$                            30,813	$                            30,748