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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Summary) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Long-term debt obligations |  |
Long-term debt | $ 290,526 | $ 268,919
Less current portion | 54,556 | 61,930
Long-term debt, less current portion | 235,970 | 206,989
Payments under long-term debt obligations |  |
Due in one year or less | 63,922 |
Due after one year through two years | 45,366 |
Due after two years through three years | 43,085 |
Due after three years through four years | 149,390 |
Due after four years through five years | 16,257 |
Due after five years | 1,771 |
Total payments | 319,791 |
Less amounts representing interest | 29,265 |
Long-term debt | 290,526 | 268,919
Credit Facility |  |
Long-term debt obligations |  |
Long-term debt | $ 70,000 | 70,000
Interest rate (as a percent) | 3.50% |
Payments under long-term debt obligations |  |
Due in one year or less | $ 2,752 |
Due after one year through two years | 3,041 |
Due after two years through three years | 3,030 |
Due after three years through four years | 72,292 |
Total payments | 81,115 |
Less amounts representing interest | 11,115 |
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 |
Effective fixed interest rate on hedged borrowings (as a percent) | 3.10% |
Accounts receivable securitization borrowings |  |
Long-term debt obligations |  |
Long-term debt | $ 45,000 | 45,000
Interest rate (as a percent) | 3.00% |
Payments under long-term debt obligations |  |
Due in one year or less | $ 1,609 |
Due after one year through two years | 1,794 |
Due after two years through three years | 1,789 |
Due after three years through four years | 45,151 |
Total payments | 50,343 |
Less amounts representing interest | 5,343 |
Long-term debt | 45,000 | 45,000
Notes payable |  |
Long-term debt obligations |  |
Long-term debt | $ 175,206 | 153,441
Weighted-average interest rate (as a percent) | 3.30% |
Payments under long-term debt obligations |  |
Due in one year or less | $ 59,323 |
Due after one year through two years | 40,446 |
Due after two years through three years | 38,259 |
Due after three years through four years | 31,944 |
Due after four years through five years | 16,257 |
Due after five years | 1,771 |
Total payments | 188,000 |
Less amounts representing interest | 12,794 |
Long-term debt | 175,206 | 153,441
Capital lease obligations |  |
Long-term debt obligations |  |
Long-term debt | $ 320 | 478
Weighted-average interest rate (as a percent) | 5.60% |
Payments under long-term debt obligations |  |
Due in one year or less | $ 238 |
Due after one year through two years | 85 |
Due after two years through three years | 7 |
Due after three years through four years | 3 |
Total payments | 333 |
Less amounts representing interest | 13 |
Long-term debt | $ 320 | $ 478

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