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Tax Receivable Agreements (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 01, 2018
Apr. 15, 2015
Feb. 28, 2017
Mar. 31, 2018
Dec. 31, 2017
Tax Receivable Agreements [Abstract]          
Payment on applicable cash tax savings (as a percent)   85.00%      
First payment made     $ 7,000    
Deferred tax assets related to exchange of units   $ 220,800      
Minimum tax receivable agreement obligation over the agreed period   300      
Maximum tax receivable agreement obligation over the agreed period   $ 12,800      
Period over which the obligations are to be settled   15 years      
Reduction of paid-in capital for the difference between TRA liability and related deferred tax asset.   $ 19,900      
U.S. federal statutory rate (as a percent) 21.00%       35.00%
Reduction to additional paid-in capital as a result of differences between estimate and tax returns       $ 86,600  
Deferred tax assets       99,100 $ 101,600
Tax receivable agreement obligations       $ 147,040 $ 147,040