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Incentive Plan - Phantom Stock Awards Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
May 15, 2019
Mar. 22, 2019
Feb. 08, 2018
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense related to share-based arrangements       $ 8,700 $ 27,300
Phantom Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued in period   370,350 82,350    
Vesting period   3 years 3 years    
Compensation expense related to share-based arrangements       $ 200  
Target number of shares       1,069,320  
Phantom Stock Awards | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of target number of shares 0.00%        
Phantom Stock Awards | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of target number of shares 150.00%        
Phantom Stock Awards | Members of management          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued in period 524,160        
Vesting period 3 years        
Phantom Stock Awards | Non-employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued in period 54,000        
Phantom Stock Awards | May 21, 2018          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense related to share-based arrangements       $ 100 $ 700
Phantom Stock Awards | May 15, 2019 | Members of management          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense related to share-based arrangements       100  
Phantom Stock Awards | May 15, 2019 | Non-employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense related to share-based arrangements       $ 31