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RETIREMENT AND DEFERRED COMPENSATION PLANS (Schedule of Estimated Benefit Payments to Defined Benefit Plans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
United States      
Defined contribution plan      
Total contributions by Company $ 3,700 $ 3,300 $ 3,100
Estimated benefit payments relating to defined benefit plans over the next ten years      
2019 9,929    
2020 10,380    
2021 10,583    
2022 11,103    
2023 11,644    
2024 - 2028 $ 66,502    
United States | Maximum      
Defined contribution plan      
Employer matching contribution as a percentage of salary 3.00%    
Foreign Plans      
Defined contribution plan      
Total contributions by Company $ 2,400 $ 2,200 $ 1,900
Estimated benefit payments relating to defined benefit plans over the next ten years      
2019 4,033    
2020 3,490    
2021 3,409    
2022 3,653    
2023 4,708    
2024 - 2028 $ 31,426