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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Assets and Liabilities Measured on Recurring Basis
The following table sets forth, by level within the fair value hierarchy, our financial assets and liabilities that are accounted for at fair value on a recurring basis as of December 31, 2017 and 2016. As required by ASC 820, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement (in thousands):
 
December 31, 2017
 
Quoted Prices
in Active Markets for
Identical Items 
(Level 1)
 
Significant 
Other
Observable
Inputs (Level 2)
 
Significant
Unobservable
Inputs (Level 3)
 
Total
Liabilities:
 
 
 
 
 
 
 
Contingent consideration1
$
—

 
$
—

 
$
1,712

 
$
1,712

Net investment hedge
$
—

 
$
(3,246
)
 
$
—

 
$
(3,246
)
Embedded derivative in convertible debt
$
—

 
$
20,594

 
$
—

 
$
20,594

 
 
December 31, 2016
 
Quoted Prices in Active
Markets for
Identical Items 
(Level 1)
 
Significant 
Other
Observable
Inputs (Level 2)
 
Significant
Unobservable
Inputs (Level 3)
 
Total
Liabilities:
 
 
 
 
 
 
 
Contingent consideration1
$
—

 
$
—

 
$
3,739

 
$
3,739

Net investment hedge
$
—

 
$
(5,048
)
 
$
—

 
$
(5,048
)
 ______________
1    Inclusive of both current and noncurrent portions.
Summary of Changes in Fair Value of Level 3 Contingent Consideration
The following table represents the changes in the fair value of Level 3 contingent consideration (in thousands):
 
Twelve Months Ended December 31,
 
2017
 
2016
Beginning balance
$
3,739

 
$
3,638

Accretion of liability
222

 
366

Foreign currency effects
203

 
80

Payment
(1,278
)
 
(4,000
)
Revaluation
(1,174
)
 
2,184

Acquisitions
—

 
1,471

Ending balance
$
1,712

 
$
3,739