Fair Value Disclosures (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Schedule of financial instruments measured at fair value on a recurring basis

	December 31, 2012 Fair value measurements using						Total
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In thousands)
Assets:
U.S. Treasury securities	$	0	$	38,988	$	0	$	38,988
Money market funds		52		0		0		52
Total assets at fair value	$	52	$	38,988	$	0	$	39,040

The above table excludes $4.5 million of cash held in banks.

	December 31, 2011 Fair value measurements using						Total
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In thousands)
Assets:
U.S. Treasury securities	$	0	$	48,987	$	0	$	48,987
Money market funds		3,617		0		0		3,617
Total assets at fair value	$	3,617	$	48,987	$	0	$	52,604

Schedule of short-term investments

	December 31, 2012
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	38,980	$	8	$	0	$	38,988
Total	$	38,980	$	8	$	0	$	38,988

	December 31, 2011
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	48,970	$	17	$	0	$	48,987
Total	$	48,970	$	17	$	0	$	48,987