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LONG-TERM OBLIGATIONS (Details)
$ in Thousands
 1 Months Ended
Feb. 28, 2015
USD ($)
Dec. 31, 2014
USD ($)
item
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Long-Term Obligations        
Proceeds from private placement   $ 475,000    
Number of maturity tranches in funding of private placement | item   2    
Long-term obligations gross including current maturities     $ 781,499 $ 814,413
Current maturities of long-term obligations     (3,228) (51,889)
Total long-term obligations     778,271 762,524
Deferred Finance Costs, Net, Total     1,505 1,681
Deferred debt issuance costs current       (5)
Deferred debt issuance costs noncurrent     1,505 1,676
Long-term obligations including current maturities     779,994 812,732
Current maturities of long-term obligations     (3,228) (51,884)
Long-term obligations     776,766 760,848
Aggregate long-term maturities, excluding capital lease obligations        
2016     2,707  
2017     3,603  
2018     78,604  
2019     4,686  
2020     85,816  
Thereafter     604,226  
Notes payable        
Long-Term Obligations        
Proceeds from debt $ 225,000 $ 250,000    
Notes payable 0.61% - 16.00%, due in monthly and annual installments through 2027        
Long-Term Obligations        
Long-term obligations gross including current maturities     20,641 3,785
Long-term obligations including current maturities     $ 20,641 $ 3,785
Notes payable 0.61% - 16.00%, due in monthly and annual installments through 2027 | Minimum        
Long-Term Obligations        
Interest rate on notes (as a percent)     0.61% 0.61%
Notes payable 0.61% - 16.00%, due in monthly and annual installments through 2027 | Maximum        
Long-Term Obligations        
Interest rate on notes (as a percent)     16.00% 14.50%
Senior unsecured notes 6.0% due in 2016        
Long-Term Obligations        
Long-term obligations gross including current maturities       $ 50,000
Deferred Finance Costs, Net, Total       5
Long-term obligations including current maturities       $ 49,995
Interest rate on notes (as a percent)       6.00%
Senior unsecured notes 6.0%, due in 2018        
Long-Term Obligations        
Long-term obligations gross including current maturities     $ 75,000 $ 75,000
Deferred Finance Costs, Net, Total     44 63
Long-term obligations including current maturities     $ 74,956 $ 74,937
Interest rate on notes (as a percent)     6.00% 6.00%
Senior unsecured notes 3.8%, due in 2020        
Long-Term Obligations        
Long-term obligations gross including current maturities     $ 84,000 $ 84,000
Deferred Finance Costs, Net, Total     128 150
Long-term obligations including current maturities     $ 83,872 $ 83,850
Interest rate on notes (as a percent)     3.80% 3.80%
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     144 163
Long-term obligations including current maturities     $ 74,856 $ 74,837
Interest rate on notes (as a percent)     3.20% 3.20%
Senior unsecured notes 3.5%, due in 2023        
Long-Term Obligations        
Term of debt   9 years    
Long-term obligations gross including current maturities     $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total     265 293
Long-term obligations including current maturities     $ 124,735 $ 124,707
Interest rate on notes (as a percent)     3.49% 3.49%
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     107 118
Long-term obligations including current maturities     $ 49,893 $ 49,882
Interest rate on notes (as a percent)     3.40% 3.40%
Senior unsecured notes 3.5%, due in 2024        
Long-Term Obligations        
Term of debt 9 years      
Long-term obligations gross including current maturities     $ 100,000 $ 100,000
Deferred Finance Costs, Net, Total     265 293
Long-term obligations including current maturities     $ 99,735 $ 99,707
Interest rate on notes (as a percent)     3.49% 3.49%
Senior unsecured notes 3.6%, due in 2025        
Long-Term Obligations        
Term of debt   11 years    
Long-term obligations gross including current maturities     $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total     276 298
Long-term obligations including current maturities     $ 124,724 $ 124,702
Interest rate on notes (as a percent)     3.61% 3.61%
Senior unsecured notes 3.6%, due in 2026        
Long-Term Obligations        
Term of debt 11 years      
Long-term obligations gross including current maturities     $ 125,000 $ 125,000
Deferred Finance Costs, Net, Total     276 298
Long-term obligations including current maturities     $ 124,724 $ 124,702
Interest rate on notes (as a percent)     3.61% 3.61%
Capital lease obligations        
Long-Term Obligations        
Long-term obligations gross including current maturities     $ 1,858 $ 1,628
Long-term obligations including current maturities     $ 1,858 $ 1,628