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Fair Value Measurements of Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2011
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):
December 31, 2011
Level 1
Level 2
Level 3
Total
Available for sale marketable securities:
 
 
 
 
Agency bonds
$
—

$
58,533

$
—

$
58,533

Commercial paper
—

5,000

—

5,000

Certificates of deposit
—

3,211

—

3,211

Trading securities:
 
 
 
 
Equity securities – mutual funds
2,810

—

—

2,810

Derivative contracts, net
—

(13,967
)
—

(13,967
)
Total
$
2,810

$
52,777

$
—

$
55,587

December 31, 2010
Level 1
Level 2
Level 3
Total
Available for sale marketable securities:
 
 
 
 
U.S. Government-backed securities
$
68,497

$
—

$
—

$
68,497

Agency bonds
—

5,000

—

5,000

Certificates of deposit
—

6,322

—

6,322

Trading securities:
 
 
 
 
Equity securities – mutual funds
2,869

—

—

2,869

Derivative contracts, net
—

94

—

94

Total
$
71,366

$
11,416

$
—

$
82,782
Schedule of Fair Value Convertible Debt Outstanding
Our fixed rate convertible debt outstanding was as follows (in thousands):
 
December 31,
2011
Fixed rate convertible debt on balance sheet
$
89,011

Fair value of fixed rate convertible debt
130,900