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Share-Based Compensation - Cash-Settled Plans, Narrative (Details)
12 Months Ended
Jan. 08, 2019
Jun. 30, 2020
Vesting_Installlment
shares
Dec. 29, 2017
$ / shares
Phantom Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share price (dollars per share) | $ / shares     $ 4.76
RSUs outstanding | shares   0  
2018 Performance Incentive Plan | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of vesting installments | Vesting_Installlment   3  
Vesting period   3 years  
2018 Performance Incentive Plan | Phantom Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year