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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income taxes        
Provision for income taxes $ 4,721 $ 6,079 $ 10,165 $ 10,379
Effective tax rate (as a percent) 15.00% 18.00% 16.00% 18.00%
Net deferred tax asset increase     $ 1,993  
Group LP        
Income taxes        
Deferred tax assets attributable to exchanges by partners     $ 518  
Percentage of cash distribution to partners in connection to IPO attributable to exchanges by partners, payable to partners     85.00%  
Cash distribution to partners in connection to IPO attributable to exchanges by partners, payable to partners     $ 440  
Period of tax receivable agreement     15 years