Fair Value Measurements of Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 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):

March 31, 2013	Level 1		Level 2			Level 3		Total
Available for sale marketable securities:
U.S. treasury notes	$	53,034	$	—		$	—	$	53,034
Agency bonds	—		35,608			—		35,608
Commercial paper	—		9,998			—		9,998
Certificates of deposit	—		6,271			—		6,271
Municipal bonds	—		16,958			—		16,958
Trading securities:
Equity securities – mutual funds	3,911		—			—		3,911
Derivative contracts, net	—		(2,332		)	—		(2,332		)
Total	$	56,945	$	66,503		$	—	$	123,448

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

Schedule of Fair Value Convertible Debt Outstanding

Our fixed rate convertible debt outstanding was as follows (in thousands):

	March 31, 2013
Fixed rate convertible debt on balance sheet	$	89,010
Fair value of fixed rate convertible debt	195,749