Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2012

Financial Instruments [Abstract]

Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis

									Fair Value Measurements Using
									Quoted Prices in Active Markets		Significant Other
	Par		Amortized		Gross Unrealized		Gross Unrealized		for Identical Assets		Observable Inputs		Total Fair Value
	Value		Cost		Gains		Losses		(Level 1)		(Level 2)		Measurements
June 30, 2012
U.S. Treasury securities	$	37,300	$	37,288	$	2	$	-	$	37,290	$	-	$	37,290
December 31, 2011
U.S. Treasury securities	$	43,300	$	43,296	$	1	$	-	$	43,297	$	-	$	43,297