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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Condensed) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 01, 2016
Jan. 02, 2015
Nov. 30, 2014
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Jan. 31, 2015
Financing Arrangements              
Amounts collateralized by restricted funds       $ 961 $ 961 $ 1,384  
Interest rate swap agreement              
Financing Arrangements              
Term of swap agreement     5 years        
Notional amount       $ 50,000 $ 50,000    
Fixed interest rate payments (as a percent)       1.85% 1.85%    
Interest rate swap agreement | Other long-term liabilities              
Financing Arrangements              
Fair value       $ 2,000 $ 2,000 $ 900  
Credit Facility              
Financing Arrangements              
Term loan balance refinanced with revolving credit facility   $ 70,000          
Maximum borrowing capacity       150,000 150,000    
Additional borrowing capacity that may be requested       75,000 75,000    
Credit Facility | Interest rate swap agreement              
Financing Arrangements              
Amount of borrowings covered by the interest rate swap       $ 50,000 $ 50,000    
Effective fixed interest rate on hedged borrowings (as a percent)       3.10% 3.10%    
Letters of Credit, Sub-Facility              
Financing Arrangements              
Maximum borrowing capacity       $ 20,000 $ 20,000    
Accounts receivable securitization program              
Financing Arrangements              
Maximum borrowing capacity       100,000 100,000   $ 75,000
Additional borrowing capacity that may be requested       25,000 25,000    
Amount outstanding       35,000 35,000    
Outstanding letters of credit       19,300 19,300    
Remaining borrowing capacity       45,700 45,700    
Letter of Credit Agreements              
Financing Arrangements              
Outstanding letters of credit       20,900 20,900    
Amounts collateralized by restricted funds       1,000 1,000    
Surety bonds              
Financing Arrangements              
Outstanding surety bonds under uncollateralized bond programs       56,400 56,400    
Revenue equipment | Freight Transportation (ABF Freight) | Notes payable              
Financing Arrangements              
Equipment financed during the period under notes payable       $ 33,900 $ 35,800    
Revenue equipment | Freight Transportation (ABF Freight) | Notes payable | Subsequent Event              
Financing Arrangements              
Equipment financed during the period under notes payable $ 11,200