EMPLOYER SPONSORED BENEFIT PLANS - Trust Assets at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	$ 46,562	$ 43,938
Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	15,004	16,729
International equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	12,473	10,903
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	12,293	3,724
U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value		2,686
Corporate and foreign bonds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value		1,701
Real assets
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	2,219	3,010
Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	4,280	4,009
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	293	1,176
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	42,282	38,520
Level 1 | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	15,004	16,729
Level 1 | International equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	12,473	10,903
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	12,293	3,724
Level 1 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value		0
Level 1 | Corporate and foreign bonds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value		0
Level 1 | Real assets
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	2,219	3,010
Level 1 | Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	4,009
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	293	145
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	5,418
Level 2 | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | International equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value		2,686
Level 2 | Corporate and foreign bonds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value		1,701
Level 2 | Real assets
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	1,031
Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	4,280	0
Measured at NAV | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Measured at NAV | International equities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Measured at NAV | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Measured at NAV | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value		0
Measured at NAV | Corporate and foreign bonds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value		0
Measured at NAV | Real assets
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	0	0
Measured at NAV | Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	4,280	0
Measured at NAV | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total Assets at Fair Value	$ 0	$ 0