Fair Value Measurements of Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

Following are the disclosures related to the fair value of our financial assets and (liabilities) (in thousands):

June 30, 2013	Level 1		Level 2			Level 3		Total
Available for sale marketable securities:
U.S. treasury notes	$	37,752	$	—		$	—	$	37,752
Agency bonds	—		25,565			—		25,565
Commercial paper	—		12,998			—		12,998
Certificates of deposit	—		6,350			—		6,350
Municipal bonds	—		25,395			—		25,395
Trading securities:
Equity securities – mutual funds	4,230		—			—		4,230
Derivative contracts, net	—		(1,376		)	—		(1,376		)
Total	$	41,982	$	68,932		$	—	$	110,914

December 31, 2012	Level 1		Level 2		Level 3		Total
Available for sale marketable securities:
U.S. treasury notes	$	60,786	$	—	$	—	$	60,786
Agency bonds	—		31,157		—		31,157
Commercial paper	—		5,000		—		5,000
Certificates of deposit	—		5,494		—		5,494
Municipal bonds	—		3,228		—		3,228
Trading securities:
Equity securities – mutual funds	3,046		—		—		3,046
Derivative contracts, net	—		1,655		—		1,655
Total	$	63,832	$	46,534	$	—	$	110,366