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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value Disclosures [Abstract]  
Fair Value, Measurement Inputs, Disclosure [Table Text Block]
Assets and Liabilities
 
Quoted Prices In
Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
 (Level 2)
 
 
Significant
Unobservable
Inputs
 (Level 3)
 
 
 
 
Balance at
 June 30, 2011
 
 
(in thousands)
Assets:
 
 
 
 
 
 
 
 
Money market
 
$
7,884


 
$


 
$


 
$
7,884


U.S. treasury notes
 
3,089


 


 


 
3,089


U.S. government agency notes
 


 
21,550


 


 
21,550


Corporate debt securities
 


 
63,382


 


 
63,382


Total assets at fair value
 
$
10,973


 
$
84,932


 
$


 
$
95,905


Liabilities:
 
 
 
 
 
 
 
 
Contingent purchase price
 
$


 
$


 
$
27,416


 
$
27,416


Total liabilities at fair value
 
$


 
$


 
$
27,416


 
$
27,416


Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The changes in fair value of the Company's Level 3 contingent purchase price during the six months ended June 30, 2011 were as follows:
 
Level 3
 
(in thousands)
Balance at December 31, 2010
$
25,387


Fair value adjustment to contingent purchase price included in net income
2,029


Balance at June 30, 2011
$
27,416