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INCOME TAXES (NOL) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Operating loss and contribution carryforwards      
Number of state taxing authorities for which the entity is under examination | item 1    
State      
Operating loss and contribution carryforwards      
Operating loss carryforwards $ 19.9    
Contribution carryforwards $ 1.4    
Majority of state net operating loss and contribution carryforwards, expiration period one 15 years    
Majority of state net operating loss and contribution carryforwards, expiration period two 20 years    
Valuation allowance related to net operating loss and contribution carryforwards $ 0.8    
State | Panther      
Operating loss and contribution carryforwards      
Operating loss carryforwards 5.0    
Foreign      
Operating loss and contribution carryforwards      
Valuation allowance related to net operating loss carryforwards   $ 0.3  
Federal | Panther      
Operating loss and contribution carryforwards      
Operating loss carryforwards $ 1.5    
Net operating loss carryforwards expiration period 14 years    
Minimum | State      
Operating loss and contribution carryforwards      
State net operating loss and contribution carryforwards expiration period 5 years    
Minimum | State | Panther      
Operating loss and contribution carryforwards      
Net operating loss carryforwards expiration period 5 years    
Maximum | State      
Operating loss and contribution carryforwards      
State net operating loss and contribution carryforwards expiration period 20 years    
Maximum | State | Panther      
Operating loss and contribution carryforwards      
Net operating loss carryforwards expiration period 20 years    
Maximum | Federal      
Operating loss and contribution carryforwards      
Adjustment for completed audit     $ 0.1