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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Debt) (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Carrying Value
Fair value disclosure
Financial instruments	$ 313,477	$ 345,522
Fair Value
Fair value disclosure
Financial instruments	321,636	350,894
Credit Facility | Carrying Value | Level 2
Fair value disclosure
Financial instruments	70,000	70,000
Credit Facility | Fair Value | Level 2
Fair value disclosure
Financial instruments	70,000	70,000
Accounts receivable securitization borrowings | Carrying Value | Level 2
Fair value disclosure
Financial instruments		40,000
Accounts receivable securitization borrowings | Fair Value | Level 2
Fair value disclosure
Financial instruments		40,000
Notes payable | Carrying Value | Level 2
Fair value disclosure
Financial instruments	221,914	213,504
Notes payable | Fair Value | Level 2
Fair value disclosure
Financial instruments	$ 225,330	$ 216,432
New England Pension Fund withdrawal liability | Discount Rate
Fair value disclosure
Measurement input	0.024	0.034
New England Pension Fund withdrawal liability | Carrying Value | Level 2
Fair value disclosure
Financial instruments	$ 21,563	$ 22,018
New England Pension Fund withdrawal liability | Fair Value | Level 2
Fair value disclosure
Financial instruments	$ 26,306	$ 24,462

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