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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Measurements  
Schedule of assets measured at fair value on a recurring basis

 

 

 

 

At June 30,
2012

 

Quoted Prices in
Active Markets
(Level 1)

 

Significant Other
Observable
Inputs
(Level 2)

 

Significant
Unobservable
Inputs
(Level 3)

 

Cash equivalents (1)

 

$

77,126

 

$

77,126

 

$

 

$

 

Corporate debt securities (2)

 

165,140

 

 

165,140

 

 

Debt securities issued by U.S. government agencies (2)

 

52,152

 

 

52,152

 

 

Debt securities issued by the U.S. Treasury (2)

 

8,490

 

8,490

 

 

 

Debt securities issued by states of the United States and political subdivisions of the states (2)

 

24,602

 

 

24,602

 

 

Equity securities (3)

 

2,601

 

2,601

 

 

 

Total

 

$

330,111

 

$

88,217

 

$

241,894

 

$

 

 

 

 

At December 31,
2011

 

Quoted Prices in
Active Markets
(Level 1)

 

Significant Other
Observable
Inputs
(Level 2)

 

Significant
Unobservable
Inputs
(Level 3)

 

Cash equivalents (1)

 

$

58,892

 

$

55,893

 

$

2,999

 

$

 

Corporate debt securities (2)

 

166,922

 

 

166,922

 

 

Debt securities issued by U.S. government agencies (2)

 

80,440

 

 

80,440

 

 

Debt securities issued by the U.S. Treasury (2)

 

2,356

 

2,356

 

 

 

Debt securities issued by states of the United States and political subdivisions of the states (2)

 

28,469

 

 

28,469

 

 

Equity securities (3)

 

1,282

 

1,282

 

 

 

Total

 

$

338,361

 

$

59,531

 

$

278,830

 

$

 

 

(1)         Included in cash and cash equivalents on our condensed consolidated balance sheet.

 

(2)         Included in short-term investments on our condensed consolidated balance sheet.

 

(3)         Included in other current assets on our condensed consolidated balance sheet.