Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS (Details 2)

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EMPLOYEE BENEFIT PLANS (Details 2) - Defined benefit pension plan [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]        
Fair Value of Plan Assets $ 129,719 $ 113,813 $ 105,792 $ 108,172
Mutual Funds [Member] | Level 1 Inputs [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value of Plan Assets 118,474 96,079    
Cash and Cash Equivalents [Member] | Level 1 Inputs [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value of Plan Assets 7,103 15,345    
U.S. Government Agency [Member] | Level 2 Inputs [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value of Plan Assets $ 4,142 $ 2,389