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DEBT (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 18, 2018
Jun. 30, 2015
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Aug. 31, 2016
Mar. 31, 2013
Mar. 31, 2008
Debt Instrument [Line Items]                  
Amount outstanding under revolving credit facility     $ 0   $ 0        
Revolving credit facility draw down amount without violating covenant     367,000,000   367,000,000        
Loss on extinguishment of debt     2,900,000 $ 0 $ 2,900,000 $ 0      
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Term of facility   5 years              
Line of credit facility   $ 400,000,000.0              
2013 Notes                  
Debt Instrument [Line Items]                  
Increase in interest rate for every one-notch downgrade of long-term credit ratings below investment grade         0.25%        
Maximum aggregate increase in interest rate related to downgrade of long-term credit ratings below investment grade         2.00%        
Six Point Five Percent Notes Due March Two Thousand Nineteen                  
Debt Instrument [Line Items]                  
Interest rate                 6.50%
Principal amount                 $ 350,000,000.0
Repayments of principal amount $ 237,800,000                
Payment for make-whole premium 6,200,000   6,200,000            
Payment for accrued interest $ 4,600,000                
Loss on extinguishment of debt     2,900,000            
Write off debt issuance costs     300,000            
Four Point Six Zero Percent Notes, Due March Two Thousand Twenty                  
Debt Instrument [Line Items]                  
Interest rate               4.60%  
Principal amount               $ 500,000,000.0  
Five Point Zero Percent Notes, Due March Two Thousand Twenty-Three                  
Debt Instrument [Line Items]                  
Interest rate               5.00%  
Principal amount               $ 500,000,000.0  
Six Point Nine Five Percent Notes, Due March Two Thousand Forty-Three                  
Debt Instrument [Line Items]                  
Interest rate               6.95%  
Principal amount               $ 250,000,000.0  
Notes Payable, Other Payables                  
Debt Instrument [Line Items]                  
Covenant, minimum required offer to repurchase, percentage of aggregate principal amount         101.00%        
Seven Point Eight Seven Five Percent Notes, Due August Two Thousand Twenty Two                  
Debt Instrument [Line Items]                  
Interest rate             7.875%    
Principal amount             $ 500,000,000.0    
Covenant, minimum required offer to repurchase, percentage of aggregate principal amount         101.00%        
AIO                  
Debt Instrument [Line Items]                  
Standby letters of credit, recorded liability     33,000,000   $ 33,000,000        
LIBOR | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   2.50%              
Base Rate | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   1.50%              
Interest Rate Swap [Member] | Six Point Five Percent Notes Due March Two Thousand Nineteen                  
Debt Instrument [Line Items]                  
Deferred gain on termination     $ 3,600,000