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LONG TERM DEBT AND CAPITAL LEASES (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Components of Long-Term Debt and Capital Leases | A summary of long-term debt and capital leases is as follows:
| December 31,
| 2018 |  | 2017
Senior Secured Credit Facility: |  |  |
Revolving Credit Facility due May 2023; bearing interest at LIBOR plus 2.00% | $ | 69,600 |  |  | $ | — |
Refinanced Revolving Credit Facility due October 2021; bore interest at LIBOR plus 2.75% | — |  |  | 36,000 |
Term Loan Facility due May 2023; bearing interest at LIBOR plus 2.00% | 350,000 |  |  | — |
Term Loan B Facility due October 2023; bore interest at LIBOR plus 2.50% | — |  |  | 346,500 |
Tax-Exempt Bonds: |  |  |
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% | 25,000 |  |  | 25,000 |
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% | 15,000 |  |  | 15,000 |
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% | 25,000 |  |  | 25,000 |
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% | 15,000 |  |  | 15,000 |
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% | 15,000 |  |  | — |
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% | 16,000 |  |  | 16,000 |
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% | 11,000 |  |  | 11,000 |
Other: |  |  |
Capital leases maturing through December 2107; bearing interest at a weighted average of 5.37% | 11,248 |  |  | 5,595 |
Notes payable maturing through June 2027; bearing interest at a weighted average of 2.97% | 2,401 |  |  | 2,585 |
Principal amount of long-term debt and capital leases | 555,249 |  |  | 497,680 |
Less—unamortized discount and debt issuance costs (1) | 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 |
| $ | 542,001 |  |  | $ | 477,576 |
(1) | A summary of unamortized discount and debt issuance costs by debt instrument follows:
| December 31,
| 2018 |  | 2017
Credit Facility | $ | 7,118 |  |  | $ | — |
Refinanced Revolving Credit Facility | — |  |  | 3,938 |
Term Loan B Facility (including unamortized discount of $0 and $1,482) | — |  |  | 7,392 |
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-1 | 847 |  |  | 1,034 |
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 | 450 |  |  | 511 |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 | 517 |  |  | 603 |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 | 622 |  |  | 691 |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 | 493 |  |  | — |
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 | 595 |  |  | 573 |
Business Finance Authority of the State of NH Solid Waste Disposal Revenue Bonds Series 2013 | 308 |  |  | 436 |
| $ | 10,950 |  |  | $ | 15,178 |
Components of Interest Expense | The components of interest expense are as follows:
| Fiscal Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Interest expense on long-term debt and capital leases | $ | 23,816 |  |  | $ | 22,060 |  |  | $ | 34,741 |
Amortization of debt issuance costs and discount on long-term debt | 2,449 |  |  | 2,692 |  |  | 3,881 |
Letter of credit fees | 169 |  |  | 703 |  |  | 593 |
Less: capitalized interest | (140 | ) |  | (295 | ) |  | (273 | )
Total interest expense | $ | 26,294 |  |  | $ | 25,160 |  |  | $ | 38,942 |
Schedule of Cash Flow Hedges Related to Derivative Instruments | A summary of the effect of cash flow hedges related to derivative instruments on the consolidated balance sheet follows:
|  |  | Fair Value
| Balance Sheet Location |  | December 31, 2018 |  | December 31, 2017
Interest rate swaps | Other current assets |  | $ | 338 |  |  | $ | — |
Interest rate swaps | Other non-current assets |  | 482 |  |  | 401 |
Total |  |  | $ | 820 |  |  | $ | 401 |
Interest rate swaps | Other accrued liabilities |  | $ | 387 |  |  | $ | 123 |
Interest rate swaps | Other long-term liabilities |  | 1,555 |  |  | — |
Total |  |  | $ | 1,942 |  |  | $ | 123 |
Interest rate swaps | Accumulated other comprehensive (loss) income, net |  | $ | (1,196 | ) |  | $ | 278 |
Interest rate swaps - tax provision | Accumulated other comprehensive (loss) income, net |  | $ | (112 | ) |  | $ | (112 | )
|  |  | $ | (1,308 | ) |  | $ | 166 |
Schedule of Gain (Loss) On Cash Flow Hedges | A summary of the amount of gain or (loss) on cash flow hedging relationships related to interest rate swaps reclassified from accumulated other comprehensive (loss) income into earnings follows:
|  | Fiscal Year Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Statement of Operations Location |  | (Expense) Income
Interest expense |  | $ | (363 | ) |  | $ | (421 | ) |  | $ | — |
Schedule of Future Maturities of Debt | Aggregate principal maturities of long-term debt and capital leases are as follows:
Estimated Future Payments as of December 31, 2018
2019 | $ | 2,298 |
2020 | 2,648 |
2021 | 2,175 |
2022 | 1,652 |
2023 | 421,021 |
Thereafter | 125,455 |
| $ | 555,249 |

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