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EMPLOYEE RETIREMENT PLANS - Schedule of fair value hierarchy (Details) - Plan Assets [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	$ 43,144	$ 41,036
Subtotal [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	43,075	40,945
Common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	19,390	17,490
Preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	272	316
Exchange traded funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	6,033	5,213
Corporate obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	4,349	4,626
State and municipal obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	821	1,062
Pooled fixed income funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	7,117	7,598
U.S. government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	763	364
Marketable CD's [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	513	806
Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	3,817	3,470
Other assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	69	91
Fair Value, Inputs, Level 1 [Member] | Subtotal [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	34,406	32,032
Fair Value, Inputs, Level 1 [Member] | Common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	17,194	15,464
Fair Value, Inputs, Level 1 [Member] | Preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	245	287
Fair Value, Inputs, Level 1 [Member] | Exchange traded funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	6,033	5,213
Fair Value, Inputs, Level 1 [Member] | Corporate obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 1 [Member] | State and municipal obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 1 [Member] | Pooled fixed income funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	7,117	7,598
Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 1 [Member] | Marketable CD's [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	3,817	3,470
Fair Value, Inputs, Level 2 [Member] | Subtotal [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	8,669	8,913
Fair Value, Inputs, Level 2 [Member] | Common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	2,196	2,026
Fair Value, Inputs, Level 2 [Member] | Preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	27	29
Fair Value, Inputs, Level 2 [Member] | Exchange traded funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 2 [Member] | Corporate obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	4,349	4,626
Fair Value, Inputs, Level 2 [Member] | State and municipal obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	821	1,062
Fair Value, Inputs, Level 2 [Member] | Pooled fixed income funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	763	364
Fair Value, Inputs, Level 2 [Member] | Marketable CD's [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	513	806
Fair Value, Inputs, Level 2 [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | Subtotal [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | Common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | Preferred stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | Exchange traded funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | Corporate obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | State and municipal obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | Pooled fixed income funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | U.S. government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | Marketable CD's [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	0	0
Fair Value, Inputs, Level 3 [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets, Total	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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