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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined contribution plan - Domestic Plans      
Defined contribution plan      
Total contributions by Company $ 3,100 $ 3,000 $ 2,800
Defined contribution plan - Domestic Plans | Maximum      
Defined contribution plan      
Employer matching contribution as a percentage of salary 3.00%    
Defined contribution plan - Foreign Plans      
Defined contribution plan      
Total contributions by Company $ 1,900 $ 2,100 $ 2,300
Domestic Plans      
Estimated benefit payments relating to defined benefit plans over the next ten years      
2017 8,156    
2018 8,471    
2019 8,717    
2020 9,407    
2021 10,145    
2022 - 2026 60,105    
Foreign Plans      
Estimated benefit payments relating to defined benefit plans over the next ten years      
2017 1,964    
2018 1,655    
2019 2,449    
2020 3,865    
2021 2,762    
2022 - 2026 $ 20,354