Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary Of Significant Accounting Policies [Abstract]

Investment In Money Market Funds [Table Text Block]

		2012
		Cost		Fair Value
		In thousands
BlackRock Liquidity Temporary Fund - Institutional	$	58,620	$	58,620
		2011
		Cost		Fair Value
		In thousands
BlackRock Liquidity Temporary Fund - Institutional	$	42,273	$	42,273

Reconciliation Of Liability For Asset Retirement Obligations [Table Text Block]

		2012		2011
		In thousands
Asset retirement obligation at beginning of year	$	931	$	1,407
Liabilities settled		(336)		(510)
Revisions in estimated cash flows		35		-
Accretion expense		33		34
Asset retirement obligation at end of year	$	663	$	931