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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Long-term debt obligations    
Long-term debt $ 160,845 $ 127,730
Less current portion 24,024 25,256
Long-term debt, less current portion 136,821 102,474
Payments under long-term debt obligations    
Due in one year or less 26,506  
Due after one year through two years 25,901  
Due after two years through three years 45,853  
Due after three years through four years 2,896  
Due after four years through five years 71,483  
Total payments 172,639  
Less amounts representing interest 11,794  
Long-term debt 160,845 127,730
Credit Facility    
Long-term debt obligations    
Long-term debt $ 70,000  
Interest rate (as a percent) 1.40%  
Payments under long-term debt obligations    
Due in one year or less $ 1,175  
Due after one year through two years 1,685  
Due after two years through three years 2,136  
Due after three years through four years 2,469  
Due after four years through five years 71,347  
Total payments 78,812  
Less amounts representing interest 8,812  
Long-term debt 70,000  
Term Loan    
Long-term debt obligations    
Long-term debt   70,000
Payments under long-term debt obligations    
Long-term debt   70,000
Accounts receivable securitization program    
Long-term debt obligations    
Long-term debt $ 35,000  
Interest rate (as a percent) 1.00%  
Payments under long-term debt obligations    
Due in one year or less $ 436  
Due after one year through two years 692  
Due after two years through three years 35,444  
Total payments 36,572  
Less amounts representing interest 1,572  
Long-term debt 35,000  
Notes payable    
Long-term debt obligations    
Long-term debt $ 54,959 56,759
Weighted-average interest rate (as a percent) 1.90%  
Payments under long-term debt obligations    
Due in one year or less $ 24,684  
Due after one year through two years 23,308  
Due after two years through three years 8,051  
Due after three years through four years 198  
Total payments 56,241  
Less amounts representing interest 1,282  
Long-term debt 54,959 56,759
Capital lease obligations    
Long-term debt obligations    
Long-term debt $ 886 971
Weighted-average interest rate (as a percent) 5.80%  
Payments under long-term debt obligations    
Due in one year or less $ 211  
Due after one year through two years 216  
Due after two years through three years 222  
Due after three years through four years 229  
Due after four years through five years 136  
Total payments 1,014  
Less amounts representing interest 128  
Long-term debt $ 886 $ 971