Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Assets Measured At Fair Value

The following tables present the Company’s assets that are measured at fair value on a recurring basis:

	September 30, 2013
(in thousands)	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total Fair Value Measurements
Short-term investments:
Mutual fund	$	2,487	$	—		$	—	$	2,487
U.S. government and agency securities	—		2,964			—		2,964
Corporate obligations	—		14,131		*	—		14,131
Other fixed income securities	—		441			—		441
International securities	—		3,809			—		3,809
Municipal obligations	—		1,972			—		1,972
Total short-term investments	$	2,487	$	23,317		$	—	$	25,804

* Included in this amount is a $4.5 million corporate obligation which has been used to collateralize the Company's line of credit with Bank of America, and is included in the line item "Restricted cash and investments," a component of current assets, on the consolidated balance sheets. See Note 5, Credit Facilities, for further details.

	December 31, 2012
(in thousands)	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurements
Short-term investments:
Mutual fund	$	2,507	$	—	$	—	$	2,507
U.S. government and agency securities	—		3,510		—		3,510
Corporate obligations	—		12,796		—		12,796
Other fixed income securities	—		588		—		588
International securities	—		9,781		—		9,781
Total	$	2,507	$	26,675	$	—	$	29,182