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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Summary) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Long-term debt obligations |  |
Long-term debt | $ 268,919 | $ 243,673
Less current portion | 61,930 | 64,143
Long-term debt, less current portion | $ 206,989 | 179,530
Weighted-average interest rate (as a percent) | 2.80% |
Payments under long-term debt obligations |  |
2018 | $ 68,822 |
2019 | 42,156 |
2020 | 71,393 |
2021 | 24,343 |
2022 | 84,275 |
Thereafter | 404 |
Total payments | 291,393 |
Less amounts representing interest | 22,474 |
Long-term debt | 268,919 | 243,673
Credit Facility |  |
Long-term debt obligations |  |
Long-term debt | $ 70,000 | 70,000
Interest rate (as a percent) | 3.10% |
Payments under long-term debt obligations |  |
2018 | $ 2,329 |
2019 | 2,598 |
2020 | 2,679 |
2021 | 2,696 |
2022 | 71,392 |
Total payments | 81,694 |
Less amounts representing interest | 11,694 |
Long-term debt | 70,000 | 70,000
Credit Facility | Interest rate swap agreement |  |
Long-term debt obligations |  |
Amount of borrowings covered by the interest rate swap | $ 50,000 | $ 50,000
Effective fixed interest rate on hedged borrowings (as a percent) | 3.35% | 3.35%
Accounts receivable securitization program |  |
Long-term debt obligations |  |
Long-term debt | $ 45,000 | $ 35,000
Interest rate (as a percent) | 2.30% |
Payments under long-term debt obligations |  |
2018 | $ 1,223 |
2019 | 1,396 |
2020 | 45,358 |
Total payments | 47,977 |
Less amounts representing interest | 2,977 |
Long-term debt | 45,000 | 35,000
Notes payable |  |
Long-term debt obligations |  |
Long-term debt | $ 153,441 | 138,032
Weighted-average interest rate (as a percent) | 2.70% |
Payments under long-term debt obligations |  |
2018 | $ 65,036 |
2019 | 37,922 |
2020 | 23,329 |
2021 | 21,640 |
2022 | 12,882 |
Thereafter | 404 |
Total payments | 161,213 |
Less amounts representing interest | 7,772 |
Long-term debt | 153,441 | 138,032
Capital lease obligations |  |
Long-term debt obligations |  |
Long-term debt | $ 478 | 641
Weighted-average interest rate (as a percent) | 5.70% |
Payments under long-term debt obligations |  |
2018 | $ 234 |
2019 | 240 |
2020 | 27 |
2021 | 7 |
2022 | 1 |
Total payments | 509 |
Less amounts representing interest | 31 |
Long-term debt | $ 478 | $ 641

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