Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table

Assets and liabilities measured and recorded at fair value on a recurring basis at December 31, 2012 were as follows:
	Carrying Amount		Total Fair Value		Cash		Level 1		Level 2		Level 3
Measured on a recurring basis:
Assets:
Cash	$	63,104	$	63,104	$	63,104	$	—	$	—	$	—
Cash equivalents	53,549		53,549		—		53,549		—		—
Short-term—marketable securities	22,305		22,305		—		4,510		17,795		—
Non-Qualified Deferred Compensation Plan Funds	4,591		4,591		—		4,591		—		—
Total	$	143,549	$	143,549	$	63,104	$	62,650	$	17,795	$	—
Liabilities:
Earnout and milestone payment liability	$	5,457	$	5,457	$	—	$	—	$	—	$	5,457
Non-Qualified Deferred Compensation Plan	4,591		4,591		—		4,591		—		—
Total	$	10,048	$	10,048	$	—	$	4,591	$	—	$	5,457

Assets and liabilities measured and recorded at fair value on a recurring basis at December 31, 2011 were as follows:
	Carrying Amount		Total Fair Value		Cash		Level 1		Level 2		Level 3
Measured on a recurring basis:
Assets:
Cash	$	47,502	$	47,502	$	47,502	$	—	$	—	$	—
Cash equivalents	68,803		68,803		—		40,793		28,010		—
Short-term—marketable securities	46,006		46,006		—		7,501		38,505		—
Non-Qualified Deferred Compensation Plan funds	3,635		3,635		—		3,635		—		—
Total	$	165,946	$	165,946	$	47,502	$	51,929	$	66,515	$	—
Liabilities:
Earnout payment liability	$	890	$	890	$	—	$	—	$	—	$	890
Non-Qualified Deferred Compensation Plan	3,635		3,635		—		3,635		—		—
Total	$	4,525	$	4,525	$	—	$	3,635	$	—	$	890

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

Ending earnout payment liability December 31, 2010	$	1,365
Accretion	206
Change in estimate	(681		)
Ending earnout payment liability December 31, 2011	$	890
Accretion	128
Change in estimate	(916		)
Additions	$	5,355
Ending earnout and milestone payment liability December 31, 2012	$	5,457