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INCOME TAXES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
INCOME TAXES        
Statutory federal tax rate (as a percent)     35.00%  
State tax, low end of range of rate (as a percent)     6.00%  
State tax, high end of range of rate (as a percent)     6.50%  
Effective tax (benefit) rate (as a percent) 39.30% 37.10% 38.80% 34.80%
Benefit from reduced state deferred tax liabilities reflecting enactment of lower tax rates in some states (as a percent)     0.60% 0.80%
Tax benefit from reversal of valuation allowance on foreign tax credit carryovers (as a percent)   2.40%   3.80%
Income taxes paid (in dollars)     $ 2.9 $ 6.0
Income tax refunds received (in dollars)     $ 0.1 $ 2.0