Short-term Investments (Tables)

9 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Amortized Cost and Estimated Fair Values of Short-Term Investments

The amortized cost and estimated fair values of short-term investments are summarized in the following table (in thousands):

	SEPTEMBER 30, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Securities Held-to-Maturity
Certificates of deposit, with maturities less than 1 year	$	12,684	$	1	$	(5)	$	12,680