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LONG TERM DEBT AND CAPITAL LEASES - Components of Long-Term Debt and Capital Leases (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | $ 555,249 | $ 497,680
Less—unamortized discount and debt issuance costs | 10,950 | 15,178
Long-term debt and capital leases less unamortized discount and debt issuance costs | 544,299 | 482,502
Less—current maturities of long-term debt | 2,298 | 4,926
Long-term debt and capital leases, less current maturities | 542,001 | 477,576
Revolving Credit Facility due May 2023; bearing interest at LIBOR plus 2.00% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | 69,600 | 0
Refinanced Revolving Credit Facility due October 2021; bore interest at LIBOR plus 2.75% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | 0 | 36,000
Less—unamortized discount and debt issuance costs | 0 | 3,938
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] |  |
Principal amount of long-term debt and capital leases | 25,000 | 25,000
Less—unamortized discount and debt issuance costs | $ 847 | 1,034
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] |  |
Principal amount of long-term debt and capital leases | $ 15,000 | 15,000
Less—unamortized discount and debt issuance costs | $ 450 | 511
Stated interest rate | 3.125% |
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] |  |
Principal amount of long-term debt and capital leases | $ 25,000 | 25,000
Less—unamortized discount and debt issuance costs | $ 517 | 603
Stated interest rate | 5.25% |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | $ 15,000 | 15,000
Less—unamortized discount and debt issuance costs | $ 622 | 691
Stated interest rate | 5.125% |
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] |  |
Principal amount of long-term debt and capital leases | $ 15,000 | 0
Less—unamortized discount and debt issuance costs | $ 493 | 0
Stated interest rate | 4.375% |
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | $ 16,000 | 16,000
Less—unamortized discount and debt issuance costs | $ 595 | 573
Stated interest rate | 4.625% |
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 due April 2029 - fixed rate interest period through 2019; bearing interest at 4.00% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | $ 11,000 | 11,000
Less—unamortized discount and debt issuance costs | $ 308 | 436
Stated interest rate | 4.00% |
Capital leases maturing through December 2107; bearing interest at a weighted average of 5.37% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | $ 11,248 | 5,595
Weighted average interest rate | 5.37% |
Notes payable maturing through June 2027; bearing interest at a weighted average of 2.97% |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | $ 2,401 | 2,585
Weighted average interest rate | 2.97% |
Credit Facility |  |
Debt Instrument [Line Items] |  |
Less—unamortized discount and debt issuance costs | $ 7,118 | 0
Term Loan Facility due May 2023; bearing interest at LIBOR plus 2.00% | Secured Debt |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | 350,000 | 0
Term Loan B Facility due October 2023; bore interest at LIBOR plus 2.50% | Secured Debt |  |
Debt Instrument [Line Items] |  |
Principal amount of long-term debt and capital leases | 0 | 346,500
Less—unamortized discount and debt issuance costs | 0 | 7,392
Unamortized discount | $ 0 | $ 1,482
LIBOR | Revolving Credit Facility due May 2023; bearing interest at LIBOR plus 2.00% |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.00% |
LIBOR | Refinanced Revolving Credit Facility due October 2021; bore interest at LIBOR plus 2.75% |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.75% |
LIBOR | Term Loan Facility due May 2023; bearing interest at LIBOR plus 2.00% | Secured Debt |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.00% |
LIBOR | Term Loan B Facility due October 2023; bore interest at LIBOR plus 2.50% | Secured Debt |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.50% |

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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