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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets:    
Total $ 137,052 $ 117,392
Liabilities:    
Subsidiary unit awards 185 385
Total 185 385
Money market accounts    
Assets:    
Money market accounts 137,052 117,392
Level 1    
Assets:    
Total 137,052 117,392
Liabilities:    
Subsidiary unit awards 0 0
Total 0 0
Level 1 | Money market accounts    
Assets:    
Money market accounts 137,052 117,392
Level 2    
Assets:    
Total 0 0
Liabilities:    
Subsidiary unit awards 0 0
Total 0 0
Level 2 | Money market accounts    
Assets:    
Money market accounts 0 0
Level 3    
Assets:    
Total 0 0
Liabilities:    
Subsidiary unit awards 185 385
Total 185 385
Level 3 | Money market accounts    
Assets:    
Money market accounts $ 0 $ 0