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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Summary) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Long-term debt obligations    
Long-term debt $ 282,206 $ 291,675
Less current portion 47,205 54,075
Long-term debt, less current portion 235,001 237,600
Payments under long-term debt obligations    
Due in one year or less 55,808  
Due after one year through two years 50,379  
Due after two years through three years 85,385  
Due after three years through four years 98,514  
Due after four years through five years 13,035  
Due after five years 152  
Total payments 303,273  
Less amounts representing interest 21,067  
Long-term debt 282,206 291,675
Credit Facility    
Long-term debt obligations    
Long-term debt $ 70,000 70,000
Interest rate (as a percent) 3.70%  
Payments under long-term debt obligations    
Due in one year or less $ 2,230  
Due after one year through two years 1,942  
Due after two years through three years 1,965  
Due after three years through four years 70,033  
Total payments 76,170  
Less amounts representing interest 6,170  
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% 3.10%
Accounts receivable securitization borrowings    
Long-term debt obligations    
Long-term debt $ 40,000 $ 40,000
Interest rate (as a percent) 3.30%  
Payments under long-term debt obligations    
Due in one year or less $ 1,132  
Due after one year through two years 968  
Due after two years through three years 40,243  
Total payments 42,343  
Less amounts representing interest 2,343  
Long-term debt 40,000 40,000
Notes payable    
Long-term debt obligations    
Long-term debt $ 172,054 181,409
Weighted-average interest rate (as a percent) 3.50%  
Payments under long-term debt obligations    
Due in one year or less $ 52,306  
Due after one year through two years 47,462  
Due after two years through three years 43,172  
Due after three years through four years 28,481  
Due after four years through five years 13,035  
Due after five years 152  
Total payments 184,608  
Less amounts representing interest 12,554  
Long-term debt 172,054 181,409
Finance lease obligations    
Long-term debt obligations    
Long-term debt $ 152 266
Weighted-average interest rate (as a percent) 5.50%  
Payments under long-term debt obligations    
Due in one year or less $ 140  
Due after one year through two years 7  
Due after two years through three years 5  
Total payments 152  
Long-term debt $ 152 $ 266