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LONG-TERM DEBT - Financing Activities (Details) - Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 ("New Hampshire Bonds") due April 2029 - fixed rate interest period through September 2019; bore interest at 4.00% - USD ($)	Oct. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Stated interest rate		4.00%	4.00%
Subsequent event
Debt Instrument [Line Items]
Aggregate principal amount	$ 11,000,000
Stated interest rate	2.95%

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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