Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS (Details 5)

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EMPLOYEE BENEFIT PLANS (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Percentage of plan assets 100.00%   100.00%  
Percentage of investments for long-term growth, investment strategy mix 70.00%      
Percentage of investments for near-term benefit payments, investment strategy mix 30.00%      
Pension plan assets $ 213,699   $ 219,905 $ 194,342
Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets 203,285   53,724  
Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets 1,626   145,638  
Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets $ 8,778   $ 18,770  
Cash and Cash Equivalents [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of plan assets 0.35%   0.24%  
Pension plan assets $ 7,438   $ 5,432  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets $ 7,438   $ 5,432  
Cash and Cash Equivalents [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   0.00%    
Cash and Cash Equivalents [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   5.00%    
Common Stock [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of plan assets 0.04%   14.70%  
Pension plan assets $ 1,582   $ 32,049  
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets $ 1,582   $ 32,049  
Common Stock [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   0.00%    
Common Stock [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   40.00%    
Domestic Equity Securities Other [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of plan assets 0.07%   21.80%  
Pension plan assets $ 789   $ 48,511  
Domestic Equity Securities Other [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets     16,243  
Domestic Equity Securities Other [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets $ 789   $ 32,268  
Domestic Equity Securities Other [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   0.00%    
Domestic Equity Securities Other [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   40.00%    
International equity [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of plan assets 0.02%   16.40%  
Pension plan assets $ 363   $ 36,156  
International equity [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets $ 363   $ 36,156  
International equity [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   0.00%    
International equity [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   30.00%    
Fixed Income Funds [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of plan assets 91.10%   35.20%  
Pension plan assets $ 194,739   $ 77,214  
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets 170,249      
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets 474   $ 77,214  
Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets $ 24,490      
Fixed Income Funds [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   15.00%    
Fixed Income Funds [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   100.00%    
Real Estate [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of plan assets 0.20%   6.50%  
Pension plan assets $ 4,204   $ 14,074  
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets $ 4,204   $ 14,074  
Real Estate [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   0.00%    
Real Estate [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   20.00%    
Alternative/Opportunistic/Special [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Percentage of plan assets 0.21%   0.30%  
Pension plan assets $ 4,574   $ 6,469  
Alternative/Opportunistic/Special [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension plan assets $ 4,574   $ 6,469  
Alternative/Opportunistic/Special [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   0.00%    
Alternative/Opportunistic/Special [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target allocation   20.00%