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INCOME AND FRANCHISE TAXES (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
State
 
Tax credit carryforwards  
Tax credit carryforwards that do not expire $ 22.9
Federal
 
Tax credit carryforwards  
Tax credit carryforwards that do not expire 2.0
Tax credit carryforwards 12.4
Tax credit carryforwards that expire $ 10.4
Expiration period of tax credit carryforwards 20 years