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LONG TERM DEBT AND CAPITAL LEASES (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016
Senior Secured Credit Facility: |  |  |
Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 2.75% | $ | 36,000 |  |  | $ | 62,600 |
Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.50% | 346,500 |  |  | 350,000 |
Tax-Exempt Bonds: |  |  |
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 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 |  |  | — |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125% | 15,000 |  |  | 15,000 |
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 due April 2036 - fixed rate interest period through 2018; bearing interest at 4.75% | 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 |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25% | — |  |  | 21,400 |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1; letter of credit backed due January 2025 - bore interest at SIFMA Index | — |  |  | 3,600 |
Other: |  |  |
Capital leases maturing through September 2023; bearing interest at up to 7.70% | 5,595 |  |  | 5,534 |
Notes payable maturing through June 2027; bearing interest at up to 7.00% | 2,585 |  |  | 449 |
Principal amount of long-term debt and capital leases | 497,680 |  |  | 525,583 |
Less—unamortized discount and debt issuance costs (1) | 15,178 |  |  | 16,936 |
Long-term debt and capital leases less unamortized discount and debt issuance costs | 482,502 |  |  | 508,647 |
Less—current maturities of long-term debt | 4,926 |  |  | 4,686 |
| $ | 477,576 |  |  | $ | 503,961 |
(1) | A summary of unamortized discount and debt issuance costs by debt instrument follows:
| December 31,
| 2017 |  | 2016
Revolving Credit Facility | $ | 3,938 |  |  | $ | 4,965 |
Term Loan B Facility (including unamortized discount of $1,482 and $1,712) | 7,392 |  |  | 7,718 |
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 | 1,034 |  |  | 1,221 |
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 | 511 |  |  | 571 |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 | 603 |  |  | — |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 | 691 |  |  | 760 |
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 | 573 |  |  | 605 |
Business Finance Authority of the State of NH Solid Waste Disposal Revenue Bonds Series 2013 | 436 |  |  | 563 |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 | — |  |  | 502 |
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1 | — |  |  | 31 |
| $ | 15,178 |  |  | $ | 16,936 |
Components of Interest Expense | The components of interest expense are as follows:
| Fiscal Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Interest expense on long-term debt and capital leases | $ | 22,060 |  |  | $ | 34,741 |  |  | $ | 35,868 |
Amortization of debt issuance costs and discount on long-term debt | 2,692 |  |  | 3,881 |  |  | 3,977 |
Letter of credit fees | 703 |  |  | 593 |  |  | 637 |
Less: capitalized interest | (295 | ) |  | (273 | ) |  | (62 | )
Total interest expense | $ | 25,160 |  |  | $ | 38,942 |  |  | $ | 40,420 |
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, 2017
2018 | $ | 4,926 |
2019 | 5,002 |
2020 | 5,269 |
2021 | 40,773 |
2022 | 4,279 |
Thereafter | 437,431 |
| $ | 497,680 |

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