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LONG-TERM OBLIGATIONS (Details)
€ in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2017
EUR (€)
Sep. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Long-Term Obligations        
Revolving credit facility maximum borrowing capacity     $ 300,000  
Revolving credit facility maturity date     Jul. 01, 2022  
Amount outstanding under line of credit     $ 0 $ 0
Consolidated Leverage Ratio     1.15  
Consolidated Interest Coverage Ratio     12.31  
Long-term obligations gross including current maturities     $ 1,251,171 1,256,375
Current maturities of long-term obligations     (65,170) (61,833)
Total long-term obligations     1,186,001 1,194,542
Deferred Finance Costs, Net, Total     3,107 3,396
Deferred debt issuance costs noncurrent     3,107 3,396
Long-term obligations including current maturities     1,248,064 1,252,979
Current maturities of long-term obligations     (65,170) (61,833)
Long-term obligations, net of unamortized debt issuance costs     1,182,894 1,191,146
Aggregate long-term maturities, excluding capital lease obligations        
2018     64,108  
2019     58,645  
2020     58,318  
2021     58,273  
2022     132,551  
Thereafter     $ 876,163  
Minimum        
Long-Term Obligations        
Consolidated Interest Coverage Ratio     3.00  
Maximum        
Long-Term Obligations        
Consolidated Leverage Ratio     3.50  
Revolving credit facility        
Long-Term Obligations        
Proceeds from debt | € € 150,000      
Term of debt 5 years 5 years    
Interest rate on notes (as a percent) 1.10% 1.10%    
Notes payable to banks        
Long-Term Obligations        
Proceeds from debt   $ 280,000    
Term of debt 5 years 5 years    
Long-term obligations gross including current maturities     $ 280,000 280,000
Deferred Finance Costs, Net, Total     617 692
Long-term obligations including current maturities     $ 279,383 279,308
Interest rate on notes (as a percent) 1.36% 1.36%    
Floating interest rate prior to conversion to a fixed interest rate 2.56% 2.56% 3.61%  
Notes payable 0.61% - 18.00%, due in monthly and annual installments through 2025        
Long-Term Obligations        
Long-term obligations gross including current maturities     $ 17,748 15,349
Long-term obligations including current maturities     $ 17,748 $ 15,349
Notes payable 0.61% - 18.00%, due in monthly and annual installments through 2025 | Minimum        
Long-Term Obligations        
Interest rate on notes (as a percent)     0.00% 0.61%
Notes payable 0.61% - 18.00%, due in monthly and annual installments through 2025 | Maximum        
Long-Term Obligations        
Interest rate on notes (as a percent)     18.00% 18.00%
Senior unsecured notes 3.2%, due in 2022        
Long-Term Obligations        
Long-term obligations gross including current maturities     $ 75,000 $ 75,000
Deferred Finance Costs, Net, Total     101 113
Long-term obligations including current maturities     $ 74,899 $ 74,887
Interest rate on notes (as a percent)     3.20% 3.20%
Senior unsecured notes 3.5%, due in 2023        
Long-Term Obligations        
Long-term obligations gross including current maturities     $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total     199 217
Long-term obligations including current maturities     $ 124,801 $ 124,783
Interest rate on notes (as a percent)     3.50% 3.50%
Senior unsecured notes 0.98%, due in 2023        
Long-Term Obligations        
Proceeds from private placement | € € 100,000      
Term of debt 6 years 6 years    
Long-term obligations gross including current maturities     $ 116,770 $ 120,095
Deferred Finance Costs, Net, Total     479 526
Long-term obligations including current maturities     116,291 119,569
Interest rate on notes (as a percent) 0.98% 0.98%    
Senior unsecured notes 3.4%, due in 2024        
Long-Term Obligations        
Long-term obligations gross including current maturities     50,000 50,000
Deferred Finance Costs, Net, Total     83 89
Long-term obligations including current maturities     $ 49,917 $ 49,911
Interest rate on notes (as a percent)     3.40% 3.40%
Senior unsecured notes 3.5%, due in 2024        
Long-Term Obligations        
Long-term obligations gross including current maturities     $ 100,000 $ 100,000
Deferred Finance Costs, Net, Total     199 217
Long-term obligations including current maturities     $ 99,801 $ 99,783
Interest rate on notes (as a percent)     3.50% 3.50%
Senior unsecured notes 1.17%, due in 2024        
Long-Term Obligations        
Proceeds from private placement | € € 200,000      
Term of debt 7 years 7 years    
Long-term obligations gross including current maturities     $ 233,540 $ 240,190
Deferred Finance Costs, Net, Total     985 1,066
Long-term obligations including current maturities     232,555 239,124
Interest rate on notes (as a percent) 1.17% 1.17%    
Senior unsecured notes 3.6%, due in 2025        
Long-Term Obligations        
Long-term obligations gross including current maturities     125,000 125,000
Deferred Finance Costs, Net, Total     222 238
Long-term obligations including current maturities     $ 124,778 $ 124,762
Interest rate on notes (as a percent)     3.60% 3.60%
Senior unsecured notes 3.6%, due in 2026        
Long-Term Obligations        
Long-term obligations gross including current maturities     $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total     222 238
Long-term obligations including current maturities     $ 124,778 $ 124,762
Interest rate on notes (as a percent)     3.60% 3.60%
Capital lease obligations        
Long-Term Obligations        
Long-term obligations gross including current maturities     $ 3,113 $ 741
Long-term obligations including current maturities     $ 3,113 $ 741