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COMMITMENTS AND CONTINGENCIES - Bank Line of Credit and Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Leases          
Rent expense incurred relating to operating leases $ 3,342 $ 3,192 $ 12,801 $ 9,577  
Sublease loss reserve 0   2,359    
Sublease income 260 $ 0 784 $ 0  
Future minimum rental payments          
Remainder of 2016 (net of $85 committed sublease income) 4,305   4,305    
Committed sublease income 85   85    
2017 17,242   17,242    
2018 17,128   17,128    
2019 17,126   17,126    
2020 11,239   11,239    
Thereafter 21,952   21,952    
Total 88,992   88,992    
Unsecured revolving credit facility          
Future minimum rental 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 33,160   $ 33,160    
Unsecured revolving credit facility | LIBOR          
Future minimum rental payments          
Reference rate (as a percent)     LIBOR    
Interest rate margin (as a percent)     1.00%    
Unsecured revolving credit facility | Prime          
Future minimum rental payments          
Reference rate (as a percent)     Prime    
Interest rate margin (as a percent)     (1.50%)    
Standby letters of credit          
Future minimum rental payments          
Letters of credit outstanding $ 6,840   $ 6,840    
Fee on the outstanding balances (as a percent)     1.00%