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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Leases        
Rent expense incurred relating to operating leases $ 3,143 $ 2,677 $ 6,385 $ 5,295
Future minimum rental payments        
Remainder of 2015 7,402   7,402  
2016 14,289   14,289  
2017 14,050   14,050  
2018 13,954   13,954  
2019 13,894   13,894  
Thereafter 11,214   11,214  
Total 74,803   74,803  
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 31,727   $ 31,727  
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 $ 8,273   $ 8,273  
Fee on the outstanding balances (as a percent)     1.00%