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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details)
9 Months Ended
Sep. 30, 2015
USD ($)
Embedded_Derivative_Instruments
Sep. 30, 2014
USD ($)
Jan. 30, 2015
Dec. 31, 2014
USD ($)
Nov. 19, 2010
Derivative Instruments, Gain (Loss) [Line Items]          
Debt Instrument, Face Amount $ 600,000,000        
Derivative, Basis Spread on Variable Rate 2.298%        
Fair Value Hedges, Net $ 38,600,000     $ 18,500,000  
Number of features considered to be embedded derivative instruments | Embedded_Derivative_Instruments 2        
Minimum percentage of market price to calculated value of zero-coupon subordinated debt at which the entity is subject to contingent cash interest 120.00%        
Embedded derivative, fair value $ 0        
Embedded derivative, impact on condensed consolidated statements of operations $ 0 $ 0      
Senior notes due 2020 [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.625%   2.625%   4.625%
Debt Instrument, Face Amount       $ 618,500,000