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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Leases        
Rent expense incurred relating to operating leases $ 3,192 $ 2,756 $ 9,577 $ 8,501
Future minimum rental payments        
Remainder of 2015 3,881   3,881  
2016 14,779   14,779  
2017 14,521   14,521  
2018 14,438   14,438  
2019 14,406   14,406  
Thereafter 11,660   11,660  
Total 73,685   73,685  
Unsecured revolving credit facility        
Bank line of credit        
Commitment amount $ 40,000   $ 40,000  
Fixed rate of interest (as a percent) 3.50%   3.50%  
Borrowings under the credit facility $ 0 $ 0 $ 0 $ 0
Available credit under the facility 31,745   $ 31,745  
Unsecured revolving credit facility | LIBOR        
Bank line of credit        
Reference rate (as a percent)     LIBOR  
Interest rate margin (as a percent)     1.00%  
Unsecured revolving credit facility | Prime        
Bank line of credit        
Reference rate (as a percent)     Prime  
Interest rate margin (as a percent)     1.50%  
Standby letters of credit        
Bank line of credit        
Letters of credit outstanding $ 8,255   $ 8,255  
Fee on the outstanding balances (as a percent)     1.00%