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LONG-TERM DEBT - 6.75% Senior Notes due 2021 (Details) - USD ($)
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Mar. 04, 2011
Debt Instrument [Line Items]      
6.75% Senior Notes due 2021 $ 675,000,000 $ 675,000,000  
Fiscal Year 2016      
Debt Instrument [Line Items]      
Debt redemption price percent of principal amount 103.375%    
Fiscal Year 2017      
Debt Instrument [Line Items]      
Debt redemption price percent of principal amount 102.25%    
Fiscal Year 2018      
Debt Instrument [Line Items]      
Debt redemption price percent of principal amount 101.125%    
Fiscal Year 2019 And Thereafter      
Debt Instrument [Line Items]      
Debt redemption price percent of principal amount 100.00%    
Senior Notes 6.75 Percent Due 2021 | Prior To March 1, 2016      
Debt Instrument [Line Items]      
Senior notes, call feature At any time and from time to time prior to March 1, 2016, we may, at our option, redeem all or a portion of the 2021 Notes at a redemption price equal to 100% of the principal amount plus a premium with respect to the 2021 Notes plus accrued and unpaid interest to the redemption date. The premium is the excess of (i) the present value of the redemption price of 103.375% of the principal amount, plus all remaining scheduled interest payments due through March 1, 2016 discounted at the treasury rate plus 0.5% over (ii) the principal amount of the note. If we experience a change of control, subject to certain exceptions, we must give holders of the 2021 Notes the opportunity to sell to us their 2021 Notes, in whole or in part, at a purchase price equal to 101% of the aggregate principal amount, plus accrued and unpaid interest to the date of purchase.    
Senior notes, latest call date Mar. 01, 2016    
Debt redemption price percent of principal amount 103.375%    
Additional interest rate above Federal Funds rate 0.50%    
Debt purchase price percent of principal amount 101.00%    
Senior Notes | Senior Notes 6.75 Percent Due 2021      
Debt Instrument [Line Items]      
Debt stated percentage     6.75%
Debt instrument interest rate payment date Interest on the 2021 Notes is payable on March 1 and September 1 of each year.    
Senior notes, maturity date Mar. 01, 2021