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LONG TERM DEBT AND CAPITAL LEASES - Tax-Exempt Financings (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)
Unsecured Debt | New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-1 due December 2044 - fixed rate interest period through 2019; bearing interest at 3.75%
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 25,000,000
Unsecured Debt | New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125%
Debt Instrument [Line Items]
Aggregate principal amount outstanding	15,000,000
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25%
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 25,000,000
Stated interest rate	5.25%
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 due August 2035 - fixed rate interest period through 2025; bearing interest at 4.375%
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 15,000,000
Stated interest rate	4.375%
Aggregate principal amount issued	$ 15,000,000
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Revenue Bonds [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate during period	4.625%
New York Bonds, 2014R-1
Debt Instrument [Line Items]
Stated interest rate	3.75%
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125%
Debt Instrument [Line Items]
Stated interest rate	3.125%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 due August 2035 - fixed rate interest period through 2025
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 15,000,000
Stated interest rate	5.125%
Fixed Rate Bonds | Vermont Bonds
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 16,000,000
Stated interest rate	4.75%
Aggregate principal amount issued	$ 16,000,000
New Hampshire Bonds
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 11,000,000
Stated interest rate	4.00%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

The average effective interest rate during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Contractual interest rate for funds borrowed, under the debt agreement.

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