Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS (Details 6)

v3.3.1.900
EMPLOYEE BENEFIT PLANS (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 100.00%      
Total (as a percent)   100.00% 100.00%  
Total   $ 190,640 $ 192,163 $ 192,369
Estimated employer contribution in next fiscal year   $ 3,600    
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%    
Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   $ 56,061 68,675  
Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   115,147 102,040  
Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   $ 19,432 $ 21,448  
Cash [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 0.00%      
Cash [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 5.00%      
Common Stock [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent)   21.20% 19.40%  
Total   $ 40,510 $ 37,271  
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   $ 40,510 $ 37,271  
Common Stock [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 0.00%      
Common Stock [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 40.00%      
Domestic Equity Securities Other [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent)   20.50% 20.30%  
Total   $ 39,070 $ 38,982  
Domestic Equity Securities Other [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   12,008 12,066  
Domestic Equity Securities Other [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   $ 27,062 $ 26,916  
Domestic Equity Securities Other [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 0.00%      
Domestic Equity Securities Other [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 40.00%      
International equity [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent)   22.20% 23.20%  
Total   $ 42,373 $ 44,559  
International equity [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total      
International equity [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   $ 42,373 $ 44,559  
International equity [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 0.00%      
International equity [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 30.00%      
Debt securities - core fixed income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent)   24.00% 23.80%  
Total   $ 45,712 $ 45,768  
Debt securities - core fixed income [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   18,322  
Debt securities - core fixed income [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   $ 45,712 $ 27,446  
Debt securities - core fixed income [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 15.00%      
Debt securities - core fixed income [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 50.00%      
Real Estate [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent)   6.60% 8.90%  
Total   $ 12,565 $ 17,067  
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   $ 12,565 $ 17,067  
Real Estate [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 0.00%      
Real Estate [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 20.00%      
Real Return Funds [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 0.00%      
Total (as a percent)   0.00% 1.60%  
Total     $ 3,119  
Real Return Funds [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total     $ 3,119  
Alternative/Opportunistic/Special [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent)   3.60% 2.30%  
Total   $ 6,867 $ 4,381  
Alternative/Opportunistic/Special [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   $ 6,867 $ 4,381  
Alternative/Opportunistic/Special [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 0.00%      
Alternative/Opportunistic/Special [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent) 20.00%      
Cash and Cash Equivalents [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total (as a percent)   1.90% 0.50%  
Total   $ 3,543 $ 1,016  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Total   $ 3,543 $ 1,016