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DEBT (Details)
€ in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
EUR (€)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt          
Consolidated Leverage Ratio 1.21     1.21  
Consolidated Interest Coverage Ratio 11.77     11.77  
Long-term obligations gross including current maturities $ 1,256,375     $ 1,256,375 $ 778,788
Current maturities of long-term obligations (61,833)     (61,833) (4,603)
Total long-term obligations 1,194,542     1,194,542 774,185
Deferred Finance Costs, Net, Total 3,396     3,396 1,448
Deferred debt issuance costs noncurrent 3,396     3,396 1,448
Long-term obligations including current maturities 1,252,979     1,252,979 777,340
Current maturities of long-term obligations (61,833)     (61,833) (4,603)
Long-term obligations, net of unamortized debt issuance costs 1,191,146     1,191,146 772,737
Aggregate long-term maturities, excluding capital lease obligations          
2018 61,227     61,227  
2019 59,663     59,663  
2020 57,941     57,941  
2021 57,943     57,943  
2022 132,944     132,944  
Thereafter $ 885,916     $ 885,916  
Minimum          
Debt          
Consolidated Interest Coverage Ratio 3.00     3.00  
Maximum          
Debt          
Consolidated Leverage Ratio 3.50     3.50  
Unsecured lines of credit          
Debt          
Average borrowings       $ 64,500 $ 90,900
Average annual interest rate on short-term notes payable (as a percent)       1.90% 2.20%
Revolving credit facility          
Debt          
Amount outstanding under line of credit $ 0     $ 0 $ 166,000
Credit facility interest and fees       1,500 2,000
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          
Debt          
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 692     692  
Long-term obligations including current maturities 279,308     279,308  
Interest rate on notes (as a percent)   1.36% 1.36%    
Floating interest rate prior to conversion to a fixed interest rate   2.62% 2.62%    
Notes payable 0.61% - 18.00%, due in monthly and annual installments through 2025          
Debt          
Long-term obligations gross including current maturities 15,349     15,349 18,246
Long-term obligations including current maturities $ 15,349     $ 15,349 $ 18,246
Notes payable 0.61% - 18.00%, due in monthly and annual installments through 2025 | Minimum          
Debt          
Interest rate on notes (as a percent) 0.61%     0.61% 0.61%
Notes payable 0.61% - 18.00%, due in monthly and annual installments through 2025 | Maximum          
Debt          
Interest rate on notes (as a percent) 18.00%     18.00% 16.00%
Senior unsecured notes 6.0%, due in 2018          
Debt          
Debt prepayment amount $ 75,000        
Long-term obligations gross including current maturities         $ 75,000
Deferred Finance Costs, Net, Total         37
Long-term obligations including current maturities         $ 74,963
Interest rate on notes (as a percent)         6.00%
Senior unsecured notes 3.8%, due in 2020          
Debt          
Debt prepayment amount 84,000        
Long-term obligations gross including current maturities         $ 84,000
Deferred Finance Costs, Net, Total         119
Long-term obligations including current maturities         $ 83,881
Interest rate on notes (as a percent)         3.80%
Senior unsecured notes 3.2%, due in 2022          
Debt          
Long-term obligations gross including current maturities 75,000     $ 75,000 $ 75,000
Deferred Finance Costs, Net, Total 113     113 138
Long-term obligations including current maturities $ 74,887     $ 74,887 $ 74,862
Interest rate on notes (as a percent) 3.20%     3.20% 3.20%
Senior unsecured notes 3.5%, due in 2023          
Debt          
Long-term obligations gross including current maturities $ 125,000     $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total 217     217 256
Long-term obligations including current maturities $ 124,783     $ 124,783 $ 124,744
Interest rate on notes (as a percent) 3.50%     3.50% 3.50%
Senior unsecured notes 0.98%, due in 2023          
Debt          
Proceeds from private placement | €   € 100,000      
Term of debt   6 years 6 years    
Long-term obligations gross including current maturities $ 120,095     $ 120,095  
Deferred Finance Costs, Net, Total 526     526  
Long-term obligations including current maturities 119,569     119,569  
Interest rate on notes (as a percent)   0.98% 0.98%    
Senior unsecured notes 3.4%, due in 2024          
Debt          
Long-term obligations gross including current maturities 50,000     50,000 $ 50,000
Deferred Finance Costs, Net, Total 89     89 104
Long-term obligations including current maturities $ 49,911     $ 49,911 $ 49,896
Interest rate on notes (as a percent) 3.40%     3.40% 3.40%
Senior unsecured notes 3.5%, due in 2024          
Debt          
Long-term obligations gross including current maturities $ 100,000     $ 100,000 $ 100,000
Deferred Finance Costs, Net, Total 217     217 256
Long-term obligations including current maturities $ 99,783     $ 99,783 $ 99,744
Interest rate on notes (as a percent) 3.50%     3.50% 3.50%
Senior unsecured notes 1.17%, due in 2024          
Debt          
Proceeds from private placement | €   € 200,000      
Term of debt   7 years 7 years    
Long-term obligations gross including current maturities $ 240,190     $ 240,190  
Deferred Finance Costs, Net, Total 1,066     1,066  
Long-term obligations including current maturities 239,124     239,124  
Interest rate on notes (as a percent)   1.17% 1.17%    
Senior unsecured notes 3.6%, due in 2025          
Debt          
Long-term obligations gross including current maturities 125,000     125,000 $ 125,000
Deferred Finance Costs, Net, Total 238     238 269
Long-term obligations including current maturities $ 124,762     $ 124,762 $ 124,731
Interest rate on notes (as a percent) 3.60%     3.60% 3.60%
Senior unsecured notes 3.6%, due in 2026          
Debt          
Long-term obligations gross including current maturities $ 125,000     $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total 238     238 269
Long-term obligations including current maturities $ 124,762     $ 124,762 $ 124,731
Interest rate on notes (as a percent) 3.60%     3.60% 3.60%
Capital lease obligations          
Debt          
Long-term obligations gross including current maturities $ 741     $ 741 $ 1,542
Long-term obligations including current maturities $ 741     $ 741 $ 1,542