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Tax Receivable Agreement Liability (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Tax Receivable Agreement [Line Items]        
Deferred Tax Assets, Investment in Subsidiaries $ 111,070      
Tax receivable agreement, percentage of realized cash saving in tax to pass through 85.00%      
Tax Receivable Agreement [Roll Forward]        
Beginning balance $ 93,501      
Payments under tax receivable agreement 0 $ 0    
Payable Pursuant To Tax Receivable Agreement 96,588   $ 96,470 $ 13,636
Less current portion under tax receivable agreement (2,969)   (2,969)  
Ending balance 93,619   93,501  
Follow-On Offering [Member]        
Tax Receivable Agreement [Roll Forward]        
Additions to tax receivable agreement: 0   34,028  
Tender Offer [Member]        
Tax Receivable Agreement [Roll Forward]        
Additions to tax receivable agreement: 0   23,969  
Secondary Offering [Member]        
Tax Receivable Agreement [Roll Forward]        
Additions to tax receivable agreement: 0   $ 24,837  
Exchange of LLC Units for Class A Shares [Member]        
Tax Receivable Agreement [Roll Forward]        
Additions to tax receivable agreement: $ 118 $ 0