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.