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DEBT (Narrative) (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]          
Net interest expense     $ 125,748,000    
Long term debt $ 1,982,889,000 $ 1,980,464,000 1,982,889,000 $ 1,980,464,000  
Gross long-term debt 2,004,065,000 2,004,198,000 2,004,065,000 2,004,198,000  
Repayments of debt       530,923,000  
Repayments of Debt     130,000 695,060,000 $ 579,829,000
Purchase amount   471,122,000   471,122,000  
Transaction fees     1,860,000 7,382,000 0
Other cost (benefit) related to debt purchase       7,274,000  
Premium for repayments of debt       59,293,000  
Transaction costs for repayments of debt       508,000  
Discounts and debt issuance costs     4,418,000    
Cost of debt purchase     0 67,075,000 $ 72,949,000
Delayed Draw Term Loan And Line Of Credit [Member]          
Debt Instrument [Line Items]          
Transaction fees 1,860,000   1,860,000    
Bank Line of Credit [Member]          
Debt Instrument [Line Items]          
Maximum borrowing capacity 750,000,000   750,000,000    
Long term debt 235,000,000   $ 235,000,000    
Commitment fee     0.15%    
Available borrowing capacity 475,462,000   $ 475,462,000    
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%    
Bank Line of Credit [Member] | Maximum, Upon Certain Acquisitions [Member]          
Debt Instrument [Line Items]          
Debt to EBITDA ratio     3.75    
Standby Letters of Credit [Member]          
Debt Instrument [Line Items]          
Outstanding standby letters of credit 39,538,000   $ 39,538,000    
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]          
EBITDA to net cash interest expense ratio     3.0    
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]          
Debt to EBITDA ratio     3.5    
Commitment fee     0.25%    
Maximum [Member] | Bank Line of Credit [Member] | LIBOR [Member]          
Debt Instrument [Line Items]          
Applicable margin on borrowing rate     1.75%    
Maximum [Member] | Bank Line of Credit [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Applicable margin on borrowing rate     0.75%    
Other Notes [Member]          
Debt Instrument [Line Items]          
Gross long-term debt [1] $ 365,000 498,000 $ 365,000 498,000  
Notes [Member] | Delayed draw term loan [Member]          
Debt Instrument [Line Items]          
Number of draws | item 3        
Gross long-term debt [1],[2] $ 0 0 0 $ 0  
Face value $ 250,000,000   $ 250,000,000    
Notes [Member] | Delayed draw term loan [Member] | Quarters 5 - 8 [Member]          
Debt Instrument [Line Items]          
Interest rate 0.625%   0.625%    
Notes [Member] | Delayed draw term loan [Member] | Quarters 9 - 12 [Member]          
Debt Instrument [Line Items]          
Interest rate 1.25%   1.25%    
Notes [Member] | Delayed draw term loan [Member] | Quarters 13 - 19 [Member]          
Debt Instrument [Line Items]          
Interest rate 1.875%   1.875%    
Notes [Member] | Delayed draw term loan [Member] | Quarter 20 [Member]          
Debt Instrument [Line Items]          
Interest rate 79.375%   79.375%    
Notes [Member] | 10.125% notes due 2015 [Member]          
Debt Instrument [Line Items]          
Repayments of debt   $ 150,000,000      
Interest rate   10.125%   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 $ 400,000,000  
Face value   $ 400,000,000   $ 400,000,000  
Interest rate 4.50% 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 $ 272,512,000  
Interest rate 7.00% 7.00% 7.00% 7.00%  
Maturity year     2018    
Purchase amount   $ 127,488,000   $ 127,488,000  
Principal percentage       33.00%  
Notes [Member] | 6.40% notes due 2017 [Member]          
Debt Instrument [Line Items]          
Interest rate   6.40%   6.40%  
Maturity year     2017    
Purchase amount   $ 218,633,000   $ 218,633,000  
Principal percentage       100.00%  
Notes [Member] | 6.50% notes due 2016 [Member]          
Debt Instrument [Line Items]          
Interest rate   6.50%   6.50%  
Maturity year     2016    
Purchase amount   $ 125,001,000   $ 125,001,000  
Principal percentage       100.00%  
Notes [Member] | Investment-Grade Type Covenants Governed [Member]          
Debt Instrument [Line Items]          
Gross long-term debt $ 1,768,700,000   $ 1,768,700,000    
Industrial Revenue Bonds [Member]          
Debt Instrument [Line Items]          
Repayments of debt       $ 14,000,000  
Maturity year     2022    
[1] Non-publicly traded debt.
[2] The effective interest rate is the spread over LIBOR as of the most recent balance sheet date.