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DEBT (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2018
Feb. 28, 2018
Jan. 31, 2018
Dec. 31, 2017
Jul. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Debt Instrument [Line Items]                        
Discounts and debt issuance costs                 $ 5,161,000 $ 9,808,000    
Total long-term debt - face value       $ 2,881,529,000         2,846,396,000 2,881,529,000    
Long term debt       2,854,865,000         2,779,380,000 2,854,865,000    
Total short-term debt       0         133,000,000 0    
Repayments of long term debt         $ 565,560,000       $ 892,055,000 1,463,308,000 $ 130,000  
Net proceeds   $ 846,029,000                    
Net noncash expense       4,228,000 3,029,000         7,257,000    
Net noncash expense               $ 466,000        
Premium for repayments of debt         43,020,000     5,608,000   139,187,000    
Transaction costs for repayments of debt         $ 28,000     1,314,000   1,586,000    
Combined charge, component of interest expense               $ 7,388,000   148,030,000    
Term Loan Due 2018 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       350,000,000           350,000,000    
Total short-term debt       350,000,000           350,000,000    
Debt issued, term                 6 months      
3.90% notes due 2027 [Member]                        
Debt Instrument [Line Items]                        
Net proceeds             $ 345,450,000          
7.50% notes due 2021 [Member]                        
Debt Instrument [Line Items]                        
Face value       564,889,000           564,889,000    
Repayments of debt       662,613,000                
Premium for repayments of debt       96,167,000                
Transaction costs for repayments of debt       1,558,000                
Bank Line of Credit [Member]                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity                 $ 750,000,000      
Commitment fee                 0.15%      
Available borrowing capacity                 $ 572,021,000      
Total long-term debt - face value       235,000,000           235,000,000    
Borrowings                 $ 133,000,000      
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                 $ 44,979,000      
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%      
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%      
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%      
Notes [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value                 $ 2,846,396,000      
Face value           $ 1,000,000,000            
Net proceeds           989,512,000            
Notes [Member] | 3.90% notes due 2027 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       400,000,000         $ 400,000,000 400,000,000    
Maturity year                 2027      
Face value           $ 400,000,000            
Interest rate           3.90% 3.90%   3.90%      
Notes [Member] | 3.90% notes due 2027 [Member] | June 2017 Issuance [Member]                        
Debt Instrument [Line Items]                        
Face value           $ 50,000,000            
Notes [Member] | 3.90% notes due 2027 [Member] | March 2017 Issuance [Member]                        
Debt Instrument [Line Items]                        
Face value             $ 350,000,000          
Notes [Member] | Term loan due 2021 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value           250,000,000            
Notes [Member] | Term Loan Due 2021 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       250,000,000         $ 0 250,000,000    
Maturity year                 2021      
Notes [Member] | Investment-Grade Type Covenants Governed [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value                 $ 2,846,188,000      
Notes [Member] | 4.50% notes due 2047 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       700,000,000         $ 700,000,000 700,000,000    
Maturity year                 2047      
Face value           $ 700,000,000            
Interest rate           4.50%     4.50%      
Notes [Member] | 4.50% notes due 2025 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       400,000,000         $ 400,000,000 400,000,000    
Maturity year                 2025      
Interest rate                 4.50%      
Notes [Member] | Floating-Rate Notes Due 2020 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       250,000,000         $ 250,000,000 250,000,000    
Maturity year                 2020      
Face value           $ 250,000,000            
Notes [Member] | 10.375% notes due 2018 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value           $ 250,000,000            
Interest rate           10.375%            
Notes [Member] | 7.00% notes due 2018 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value           $ 272,512,000            
Interest rate           7.00%            
Notes [Member] | 7.50% notes due 2021 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       35,111,000         $ 0 35,111,000    
Maturity year                 2021      
Repayments of long term debt     $ 40,719,000                  
Face value     $ 35,111,000                  
Interest rate     7.50%           7.50%      
Net noncash expense     $ 263,000                  
Premium for repayments of debt     $ 5,608,000                  
Notes [Member] | 4.70% notes due 2048 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       0         $ 460,949,000 0    
Maturity year                 2048      
Face value   $ 350,000,000                    
Interest rate   4.70%             4.70%      
Net noncash expense   $ 203,000                    
Premium for repayments of debt $ 38,164,000                      
Notes [Member] | Floating-Rate Notes Due 2021 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       0         $ 500,000,000 0   $ 600,000,000
Maturity year                 2021      
Face value   $ 500,000,000                    
Interest rate                       7.50%
Notes [Member] | 7.15% notes due 2037 [Member]                        
Debt Instrument [Line Items]                        
Total long-term debt - face value       240,188,000         $ 129,239,000 240,188,000    
Maturity year                 2037      
Repayments of long term debt 110,949,000                      
Interest rate                 7.15%      
Transaction costs for repayments of debt $ 1,314,000                      
Bank Line of Credit [Member]                        
Debt Instrument [Line Items]                        
Maturity date                 Dec. 31, 2021      
Total long-term debt - face value [1]       $ 250,000,000         $ 0 $ 250,000,000    
[1] Borrowings on the bank line of credit are classified as short-term debt if we intend to repay within twelve months and as long-term debt if we have the intent and ability to extend payment beyond twelve months.