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COMMITMENTS AND CONTINGENCIES - Bank Line of Credit and Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Leases      
Rent expense incurred relating to operating leases $ 3,752 $ 3,242  
Sublease income 245 $ 0  
Future minimum rental payments      
2016 (net of $658 committed sublease income) 12,434    
Committed sublease income 658    
2017 17,428    
2018 17,345    
2019 17,352    
2020 11,534    
Thereafter 23,197    
Total 99,290    
Unsecured revolving credit facility      
Bank line of credit      
Commitment amount $ 40,000    
Fixed rate of interest (as a percent) 3.50%    
Borrowings under the credit facility $ 0   $ 0
Available credit under the facility $ 32,621    
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 $ 7,379    
Fee on the outstanding balances (as a percent) 1.00%