Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS (Details 8)

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EMPLOYEE BENEFIT PLANS (Details 8) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets $ 23,603 $ 213,699 $ 219,905
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets 17,071 179,269  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets 1,835 1,626  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets 4,697 32,804  
Cash and Cash Equivalents [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [1] 17,071 7,438  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [1] 17,071 7,438  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [1]  
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [1]  
Fixed Income Funds [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [2] 499 194,749  
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [2] 170,249  
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [2] 499 474  
Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [2] 24,026  
Domestic equity - all other [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets 899 789  
Domestic equity - all other [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets  
Domestic equity - all other [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets 899 789  
Domestic equity - all other [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets  
International equity [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [3] 437 363  
International equity [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [3]  
International equity [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [3] 437 363  
International equity [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [3]  
Real Estate [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [4] 2,235 4,204  
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [4]  
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [4]  
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [4] 2,235 4,204  
Alternative/Opportunistic/Special [member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [5] 2,462 4,574  
Alternative/Opportunistic/Special [member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [5]  
Alternative/Opportunistic/Special [member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [5]  
Alternative/Opportunistic/Special [member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets [5] $ 2,462 4,574  
Common Stock [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets   1,582  
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets   1,582  
Common Stock [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets    
Common Stock [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Pension plan assets    
[1] Cash and cash equivalents, which are used to pay benefits and plan administrative expenses, are held in Rule 2a-7 money market funds.
[2] Fixed income securities are primarily valued using a market approach with inputs that include broker quotes, benchmark yields, base spreads and reported trades.
[3] International equity securities are valued using a market approach based on the quoted market prices of identical instruments in their respective markets.
[4] Real estate fund values are primarily reported by the fund manager and are based on valuation of the underlying investments, which include inputs such as cost, discounted future cash flows, independent appraisals and market based comparable data.
[5] Alternative/Opportunistic/Special funds can invest across the capital structure in both liquid and illiquid securities that are valued using a market approach based on the quoted market prices of identical instruments, or if no market price is available, instruments will be held at their fair market value (which may be cost) as reasonably determined by the investment manager, independent dealers, or pricing services.