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LONG-TERM OBLIGATIONS (Details)
$ in Thousands
1 Months Ended 6 Months Ended
Feb. 28, 2015
USD ($)
Dec. 31, 2014
USD ($)
item
Jun. 30, 2015
USD ($)
Debt      
Proceeds from private placement   $ 475,000  
Long-term obligations including current maturities   607,584 $ 831,129
Current maturities of long-term obligations   (18,692) (18,122)
Long-term obligations   588,892 813,007
Aggregate long-term maturities, excluding capital lease obligations      
2015     17,769
2016     50,391
2017     392
2018     75,342
2019     189
Thereafter     685,161
Notes payable      
Debt      
Proceeds from debt $ 225,000 $ 250,000  
Number of maturity tranches in funding of private placement | item   2  
Notes payable 0.61% - 27.26%, due in monthly and annual installments through 2027      
Debt      
Long-term obligations including current maturities   $ 5,160 $ 4,244
Interest rate on notes payable, low end of range (as a percent)     0.61%
Interest rate on notes payable, high end of range (as a percent)     27.26%
Senior unsecured notes 2.3%, due in 2015      
Debt      
Long-term obligations including current maturities   16,000 $ 16,000
Interest rate on senior unsecured notes (as a percent)     2.30%
Senior unsecured notes 6.0%, due in 2016      
Debt      
Long-term obligations including current maturities   50,000 $ 50,000
Interest rate on senior unsecured notes (as a percent)     6.00%
Senior unsecured notes 6.0%, due in 2018      
Debt      
Long-term obligations including current maturities   75,000 $ 75,000
Interest rate on senior unsecured notes (as a percent)     6.00%
Senior unsecured notes 3.8%, due in 2020      
Debt      
Long-term obligations including current maturities   84,000 $ 84,000
Interest rate on senior unsecured notes (as a percent)     3.80%
Senior unsecured notes 3.2%, due in 2022      
Debt      
Long-term obligations including current maturities   75,000 $ 75,000
Interest rate on senior unsecured notes (as a percent)     3.20%
Senior unsecured notes 3.5%, due in 2023      
Debt      
Term of debt     9 years
Long-term obligations including current maturities   125,000 $ 125,000
Interest rate on senior unsecured notes (as a percent)     3.49%
Senior unsecured notes 3.4%, due in 2024      
Debt      
Long-term obligations including current maturities   50,000 $ 50,000
Interest rate on senior unsecured notes (as a percent)     3.40%
Senior unsecured notes 3.5%, due in 2024      
Debt      
Term of debt     9 years
Long-term obligations including current maturities     $ 100,000
Interest rate on senior unsecured notes (as a percent)     3.49%
Senior unsecured notes 3.6%, due in 2025      
Debt      
Term of debt     11 years
Long-term obligations including current maturities   125,000 $ 125,000
Interest rate on senior unsecured notes (as a percent)     3.61%
Senior unsecured notes 3.6%, due in 2026      
Debt      
Term of debt     11 years
Long-term obligations including current maturities     $ 125,000
Interest rate on senior unsecured notes (as a percent)     3.61%
Capital lease obligations      
Debt      
Long-term obligations including current maturities   $ 2,424 $ 1,885