Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2013

Asset Retirement Obligations [Abstract]

Schedule Of Asset Retirement Obligations

	Six months ended June 30, 2013	Year ended December 31, 2012
	(in thousands)
Balance at beginning of period (including current portion)	$                            33,003	$                            34,113
Accretion expense	1,178	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	(468)	(1,909)
Balance at end of period	33,713	33,003
Current portion of asset retirement obligation	1,818	2,255
Long-term portion of asset retirement obligation	$                            31,895	$                            30,748