INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
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 rate (as a percent)	37.10%	38.00%	34.80%	(44.80%)
Reversal of valuation allowance on foreign tax credit carryovers (as a percent)	2.40%		3.80%
Alternative fuel tax credit (as a percent)				9.20%
Refund of federal and state income taxes that were paid in prior years, primarily from loss carrybacks			$ 2.0
Federal, state, and foreign income taxes paid			$ 6.0