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Incentive Plan (Market Performance Based Awards) (Details)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 27, 2018
Jan. 31, 2019
shares
Mar. 31, 2019
USD ($)
simulation
shares
Mar. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (shares)     105,843  
Market performance-based awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     3 years  
Number of trials | simulation     100,000  
Fair value of awards | $     $ 20.3 $ 17.5
Award requisite service period     4 years  
Market performance-based awards | Below Threshold Level        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     0.00%  
Performance Threshold     (3.00%)  
Market performance-based awards | Threshold Level        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     25.00%  
Performance Threshold     (3.00%)  
Market performance-based awards | Target Level        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     50.00%  
Performance Threshold     1.00%  
Market performance-based awards | High Level        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     100.00%  
Performance Threshold     5.00%  
Class D Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vested (shares)   339,317    
Distribution Equivalent Unit        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vested (shares)   31,009    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vested (shares)   56,778    
2015 Performance Grant | Market performance-based awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 50.00%      
2015 Performance Grant | Market performance-based awards | First Vesting Period in February        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     50.00%  
2016 Performance Grant | Market performance-based awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     3 years  
2017 Performance Grant | Market performance-based awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period     3 years  
2017 Performance Grant | Market performance-based awards | First Vesting Period in February        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     50.00%  
2017 Performance Grant | Market performance-based awards | Second Vesting Period in February        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     50.00%  
2018 Performance Grant | Market performance-based awards | First Vesting Period in February        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     50.00%  
2018 Performance Grant | Market performance-based awards | Second Vesting Period in February        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     50.00%