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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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Represents aggregate future amounts due of contractually required rental payments on leases meeting the criteria for capitalization and maturities on long-term debt, including interest.

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Represents the interest amount by which the contractually required payments on capital leases and long-term debt are reduced to calculate the present value of the long-term debt and capital lease obligations.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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