INCOME TAXES (NOL) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
State
Tax Carryforwards [Line Items]
Operating loss carryforwards	$ 21.4
Contribution carryforwards	$ 1.0
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
Foreign
Tax Carryforwards [Line Items]
Valuation allowance related to net operating loss carryforwards	$ 0.3	$ 0.3
Foreign tax credit carryforward
Tax Carryforwards [Line Items]
Net decrease in valuation allowance		$ 0.7
Certain state net operating losses and state deferred tax assets | State
Tax Carryforwards [Line Items]
Net decrease in valuation allowance			$ 1.5
Premium Logistics (Panther) | State
Tax Carryforwards [Line Items]
Operating loss carryforwards	7.6
Premium Logistics (Panther) | Federal
Tax Carryforwards [Line Items]
Operating loss carryforwards	$ 1.9
Net operating loss carryforwards expiration period	16 years
Minimum | State
Tax Carryforwards [Line Items]
State net operating loss and contribution carryforwards expiration period	5 years
Minimum | Premium Logistics (Panther) | State
Tax Carryforwards [Line Items]
Net operating loss carryforwards expiration period	5 years
Maximum | State
Tax Carryforwards [Line Items]
State net operating loss and contribution carryforwards expiration period	20 years
Maximum | Premium Logistics (Panther) | State
Tax Carryforwards [Line Items]
Net operating loss carryforwards expiration period	20 years