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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Borrowings [Abstract]    
Long-term debt $ 376,157 $ 408,802
Less unamortized debt issuance costs (2,376) (2,714)
Less: Current portion (47,699) (38,608)
Long-term debt, less current maturities 328,458 370,194
Line of Credit [Member]    
Borrowings [Abstract]    
Long-term debt 189,546 193,443
Term Loan [Member]    
Borrowings [Abstract]    
Long-term debt 184,375 212,500
Promissory Note Payable [Member]    
Borrowings [Abstract]    
Long-term debt $ 4,612 $ 5,216
Quarterly installments 2.90% 2.90%
Unsecured Subordinated Notes Payable [Member]    
Borrowings [Abstract]    
Long-term debt $ 0 $ 357
Quarterly installments 5.00% 5.00%
Wells Fargo Bank, National Association [Member] | Line of Credit [Member]    
Borrowings [Abstract]    
Maximum borrowing capacity $ 350,000  
Wells Fargo Bank, National Association [Member] | Line of Credit [Member] | LIBOR [Member]    
Borrowings [Abstract]    
Basis spread on base rate 2.25%  
Wells Fargo Bank, National Association [Member] | Line of Credit [Member] | Prime rate [Member]    
Borrowings [Abstract]    
Basis spread on base rate 1.25%  
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member]    
Borrowings [Abstract]    
Commitment fee 0.40%  
Available for borrowing under the facility $ 31,400  
Expiration date Jan. 02, 2019  
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Minimum [Member]    
Borrowings [Abstract]    
Commitment fee 0.20%  
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Maximum [Member]    
Borrowings [Abstract]    
Commitment fee 0.50%  
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member]    
Borrowings [Abstract]    
Base rate LIBOR  
Amount outstanding $ 373,900  
Weighted average interest rate 2.45%  
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]    
Borrowings [Abstract]    
Basis spread on base rate 1.25%  
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]    
Borrowings [Abstract]    
Basis spread on base rate 2.75%  
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Prime rate [Member] | Minimum [Member]    
Borrowings [Abstract]    
Basis spread on base rate 0.25%  
Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] | Prime rate [Member] | Maximum [Member]    
Borrowings [Abstract]    
Basis spread on base rate 1.75%