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COMMITMENTS AND CONTINGENCIES - Bank Line of Credit and Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Leases          
Rent expense incurred relating to operating leases $ 3,680 $ 5,707 $ 7,436 $ 9,459  
Reduction to occupancy expenses   279   524  
Sublease loss reserve 0 $ 2,359 150 $ 2,359  
Future minimum rental payments          
Remainder of 2017 9,389   9,389    
2018 18,416   18,416    
2019 18,366   18,366    
2020 11,610   11,610    
2021 6,130   6,130    
Thereafter 16,085   16,085    
Total 79,996   79,996    
Sublease Income          
2018 (399)   (399)    
2019 (544)   (544)    
2020 (871)   (871)    
2021 (871)   (871)    
Thereafter (3,048)   (3,048)    
Total (5,733)   (5,733)    
Net Minimum Payments          
Remainder of 2017 9,389   9,389    
2018 18,017   18,017    
2019 17,822   17,822    
2020 10,739   10,739    
2021 5,259   5,259    
Thereafter 13,037   13,037    
Total 74,263   74,263    
Unsecured revolving credit facility          
Net Minimum Payments          
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
Available credit under the facility 33,001   $ 33,001    
Unsecured revolving credit facility | LIBOR          
Net Minimum Payments          
Reference rate (as a percent)     LIBOR    
Interest rate margin (as a percent)     1.00%    
Unsecured revolving credit facility | Prime          
Net Minimum Payments          
Reference rate (as a percent)     Prime    
Interest rate margin (as a percent)     (1.50%)    
Standby letters of credit          
Net Minimum Payments          
Letters of credit outstanding $ 6,999   $ 6,999    
Fee on the outstanding balances (as a percent)     1.00%