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INCOME TAXES ( Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income taxes        
Provision for income taxes $ 6,079 $ 438 $ 10,379 $ 1,080
Effective tax rate (as a percent) 18.00% (1.00%) 18.00% (3.00%)
Net deferred tax asset increase     $ 3,207  
Group LP        
Income taxes        
Deferred tax assets attributable to exchanges by partners     $ 769  
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     $ 654  
Period of tax receivable agreement     15 years