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EMPLOYEE BENEFIT PLANS Table 6 - Major Classes of Plan Assets Measured at Fair Value (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 159,036 $ 126,949 $ 129,878
Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 66,299 56,424  
Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 92,737 70,525  
Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash equivalent securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 160 608  
Cash equivalent securities [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 160 608  
Cash equivalent securities [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash equivalent securities [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. large cap equity fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 92,737 70,525  
U.S. large cap equity fund [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. large cap equity fund [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 92,737 70,525  
U.S. large cap equity fund [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International stock index fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17,473 13,391  
International stock index fund [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17,473 13,391  
International stock index fund [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International stock index fund [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Bond market index fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 48,666 42,425  
Bond market index fund [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 48,666 42,425  
Bond market index fund [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Bond market index fund [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0