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DEBT (Narrative) (Details)
1 Months Ended 3 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
item
Mar. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Discounts and debt issuance costs     $ 1,065,000  
Gross long-term debt $ 2,354,064,000 $ 2,004,065,000 2,354,064,000 $ 2,004,194,000
Transaction fees     4,565,000 0
Delayed Draw Term Loan And Line Of Credit [Member]        
Debt Instrument [Line Items]        
Transaction fees   1,876,000    
Bank Line of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity 750,000,000 750,000,000 $ 750,000,000  
Commitment fee     0.15%  
Available borrowing capacity 471,462,000   $ 471,462,000  
Borrowings 235,000,000   $ 235,000,000  
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 43,538,000   $ 43,538,000  
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] 364,000 365,000 $ 364,000 494,000
Notes [Member] | 3.90% notes due 2027 [Member]        
Debt Instrument [Line Items]        
Gross long-term debt 350,000,000 0 350,000,000 0
Face value $ 350,000,000   $ 350,000,000  
Interest rate 3.90%   3.90%  
Maturity year     2027  
Net proceeds $ 345,450,000      
Notes [Member] | Delayed draw term loan [Member]        
Debt Instrument [Line Items]        
Gross long-term debt [1],[2] $ 0 0 $ 0 $ 0
Number of draws | item     3  
Face value   $ 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] | Investment-Grade Type Covenants Governed [Member]        
Debt Instrument [Line Items]        
Gross long-term debt $ 2,118,700,000   $ 2,118,700,000  
[1] Non-publicly traded debt.
[2] The effective interest rate is the spread over LIBOR as of the most recent balance sheet date.