Short-Term Investments (Tables)

3 Months Ended

Mar. 31, 2013

Short-Term Investments [Abstract]

Available-for-sale securities recorded at fair value with unrealized gains or losses

Available-for-sale securities with contractual maturities of less than 12 months were as follows (in thousands):

	March 31, 2013							December 31, 2012
	Amortized cost basis		Gross unrealized gain(loss)			Fair value		Amortized cost basis		Gross unrealized gain(loss)			Fair value
Corporate notes, bonds and paper	$	12,178	$	11		$	12,189	$	9,091	$	(7	)	$	9,084
Government securities/money market		3,325		(1	)		3,324		4,245		(1	)		4,244
Total	$	15,503	$	10		$	15,513	$	13,336	$	(8	)	$	13,328