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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2018
Postemployment Benefits [Abstract]  
Summary of Defined Contribution Plans Expenses
The following expenses related to defined contribution plans were recorded in the Company’s consolidated statements of operations:
(in thousands)
2018
 
2017
 
2016
U.S. 401(k) Plan
$
5,506

 
$
5,003

 
$
4,510

International Plans
11,101

 
9,096

 
7,635

 
$
16,607

 
$
14,099

 
$
12,145