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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis
The assets and liabilities measured at fair value on a recurring basis are as follows (in thousands):
 
As of March 31, 2013
 
Fair Value Measurements Using
 
Total
 
Quoted Prices in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
Significant Unobservable Inputs
 
 
 
(Level 1)
 
(Level 2)
 
(Level 3)
 
 
Interest rate contracts
$
—

 
$
(254
)
 
$
—

 
$
(254
)
Contingent consideration to be paid in cash for the acquisitions
$
—

 
$
—

 
$
(6,544
)
 
$
(6,544
)
 
 
 
 
 
 
 
 
 
As of December 31, 2012
 
Fair Value Measurements Using
 
Total
 
Quoted Prices in Active Markets for Identical Assets
 
Significant Other Observable Inputs
 
Significant Unobservable Inputs
 
 
(Level 1)
 
(Level 2)
 
(Level 3)
 
 
Interest rate contracts
$
—

 
$
(348
)
 
$
—

 
$
(348
)
Contingent consideration to be paid in cash for the acquisitions
$
—

 
$
—

 
$
(7,577
)
 
$
(7,577
)
Schedule of Reconciliations of Liabilities Measured and Carried at Fair Value on Recurring Basis, with Significant Unobservable Inputs
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):
 
 
Three Months Ended
 
March 31,
 
2013
 
2012
Contingent consideration for acquisitions
 
 
 
Balance at beginning of period
$
(7,577
)
 
$
(9,856
)
Fair value adjustment
830

 
(32
)
Foreign currency translation adjustment
203

 
(203
)
Balance at end of period
$
(6,544
)
 
$
(10,091
)