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DEBT (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2015
Aug. 31, 2015
Jun. 30, 2015
Apr. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]                  
Net interest expense               $ 3,320,000  
Gross long-term debt $ 2,004,198,000             2,004,184,000 $ 2,004,203,000
Transaction fees               0 7,382,000
Cost of debt purchase               0 67,075,000
Bank Line of Credit [Member]                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity     $ 500,000,000     $ 500,000,000   $ 750,000,000  
Maturity date               Jun. 01, 2020  
Debt to EBITDA ratio               3.5  
EBITDA to net cash interest expense ratio               3.0  
Commitment fee               0.15%  
Available borrowing capacity               $ 475,160,000  
Borrowings               $ 235,000,000  
Transaction fees     $ 2,589,000            
Bank Line of Credit [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Applicable margin on borrowing rate               1.25%  
Bank Line of Credit [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Applicable margin on borrowing rate               0.25%  
Standby Letters of Credit [Member]                  
Debt Instrument [Line Items]                  
Outstanding standby letters of credit               $ 39,840,000  
Period of standby letters of credit               1 year  
Standby Letters of Credit [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Applicable margin on borrowing rate               0.175%  
Minimum [Member] | Bank Line of Credit [Member]                  
Debt Instrument [Line Items]                  
Commitment fee               0.10%  
Minimum [Member] | Bank Line of Credit [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Applicable margin on borrowing rate               1.00%  
Minimum [Member] | Bank Line of Credit [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Applicable margin on borrowing rate               0.00%  
Maximum [Member] | Bank Line of Credit [Member]                  
Debt Instrument [Line Items]                  
Commitment fee               0.35%  
Maximum [Member] | Bank Line of Credit [Member] | LIBOR [Member]                  
Debt Instrument [Line Items]                  
Applicable margin on borrowing rate               2.00%  
Maximum [Member] | Bank Line of Credit [Member] | Base Rate [Member]                  
Debt Instrument [Line Items]                  
Applicable margin on borrowing rate               1.00%  
Other Notes [Member]                  
Debt Instrument [Line Items]                  
Gross long-term debt [1] 498,000             $ 484,000 503,000
Notes [Member]                  
Debt Instrument [Line Items]                  
Repayments of debt       $ 385,024,000          
Other cost (benefit) related to debt purchase       4,136,000          
Premium for repayments of debt       41,153,000          
Transaction costs for repayments of debt       $ 52,000          
Cost of debt purchase           $ 45,341,000      
Notes [Member] | 10.125% notes due 2015 [Member]                  
Debt Instrument [Line Items]                  
Gross long-term debt 0             $ 0 150,000,000
Repayments of debt 150,000,000                
Interest rate               10.125%  
Maturity year               2015  
Notes [Member] | 4.50% notes due 2025 [Member]                  
Debt Instrument [Line Items]                  
Gross long-term debt 400,000,000             $ 400,000,000 400,000,000
Face value         $ 400,000,000   $ 400,000,000    
Interest rate         4.50%   4.50% 4.50%  
Maturity year               2025  
Net proceeds         $ 395,207,000        
Notes [Member] | 7.00% notes due 2018 [Member]                  
Debt Instrument [Line Items]                  
Gross long-term debt $ 272,512,000             $ 272,512,000 $ 272,512,000
Repayments of debt         $ 145,899,000        
Interest rate       7.00% 7.00%   7.00% 7.00%  
Maturity year               2018  
Purchase amount       $ 185,000 $ 127,303,000   $ 127,303,000    
Principal percentage       1.00% 32.00%        
Other cost (benefit) related to debt purchase         $ 3,138,000        
Premium for repayments of debt         18,140,000        
Transaction costs for repayments of debt         $ 456,000        
Cost of debt purchase             $ 21,734,000    
Notes [Member] | 6.40% notes due 2017 [Member]                  
Debt Instrument [Line Items]                  
Interest rate       6.40%          
Maturity year               2017  
Purchase amount       $ 218,633,000          
Principal percentage       100.00%          
Notes [Member] | 6.50% notes due 2016 [Member]                  
Debt Instrument [Line Items]                  
Interest rate       6.50%          
Maturity year               2016  
Purchase amount       $ 125,001,000          
Principal percentage       100.00%          
Industrial Revenue Bonds [Member]                  
Debt Instrument [Line Items]                  
Repayments of debt   $ 14,000,000              
Maturity year               2022  
[1] Non-publicly traded debt.