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NOTES PAYABLE AND CREDIT AGREEMENT - Additional Information (Details) (USD $)
 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Dec. 05, 2013
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Notes Payable, Other Payables [Member]
Installment
Dec. 31, 2013
Notes Payable, Other Payables [Member]
Installment
Dec. 31, 2012
Notes Payable, Other Payables [Member]
Installment
Jun. 30, 2014
Minimum [Member]
Jun. 30, 2014
Maximum [Member]
Jun. 30, 2014
Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]
Dec. 05, 2013
Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]
Debt Instrument [Line Items]                    
Revolving credit facility commitment                   $ 125,000,000
Maturity Date Nov. 30, 2018                  
Spread on Libor variable rate (in hundredths)             1.50% 2.50%    
Spread on base variable rate (in hundredths)             0.10% 1.00%    
Percentage of unused commitment fee (in hundredths)             0.10% 0.25%    
Revolving credit outstanding   46,300,000 41,475,000           45,000,000  
Remaining revolving credit outstanding                 80,000,000  
Aggregate amount of Notes Payable       400,000 1,300,000 350,000        
Aggregate principal installments       $ 200,000 $ 650,000 $ 175,000        
Average effective interest rate (in hundredths)       3.25% 3.25% 3.25%        
Business Acquisition Purchase Price Allocation Notes Payable Number Of Installment       2 2 2