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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Dec. 31, 2013
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on a recurring basis
The assets and liabilities measured at fair value on a recurring basis are as follows (in thousands):
 
 
As of December 31, 2013
Fair Value Measurements Using
 
Total
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Money market funds
$
15,610

 
$

 
$

 
$
15,610

Contingent consideration to be paid in cash for the acquisitions

 

 
9,793

 
9,793

 
 
As of December 31, 2012
 
Fair Value Measurements Using
 
Total
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Money market funds
$
11,820

 
$

 
$

 
$
11,820

Investments

 
2,201

 

 
2,201

Contingent consideration to be paid in cash for the acquisitions

 

 
9,756

 
9,756

Reconciliations of liabilities measured and carried at fair value on a recurring basis
Reconciliations of liabilities measured and carried at fair value on a recurring basis with the use of significant unobservable inputs (Level 3) are as follows (in thousands):
 
For the year ended December 31,
 
2013
 
2012
 
2011
Contingent consideration for acquisitions
 
 
 
 
 
Balance at beginning of period
$
9,756

 
$
1,557

 
$
11,370

Additions for acquisitions
4,474

 
9,708

 

Cash payments
(5,000
)
 
(1,557
)
 
(12,940
)
Change in estimates included in earnings
197

 
48

 
3,127

Change due to foreign exchange rate changes
366

 

 

Balance at end of period
$
9,793

 
$
9,756

 
$
1,557