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Share-based Compensation and Benefit Plans (Summary of Activity and Related Balances) (Details) - Restricted Stock Units (RSUs) [Member] - Restricted Share Unit Plan For Employees [Member]
7 Months Ended 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Shares    
Outstanding at beginning of period 0 781,307
Granted 784,621 85,104
Vested 0 (703,505)
Forfeited (3,314) (8,771)
Outstanding prior to Return of Capital and Share Consolidation 781,307 154,135
Effect of Return of Capital and Share Consolidation 0 25,167
Outstanding at end end of period 781,307 179,302
Weighted Average Grant Date Fair Value per share    
Outstanding at beginning of period | $ / shares $ 0 $ 15.99
Granted | $ / shares 15.99 16.63
Vested | $ / shares 0 15.99
Forfeited | $ / shares 15.99 16.19
Effect of Return of Capital and Share Consolidation | $ / shares 0 16.33
Outstanding at end end of period | $ / shares $ 15.99 $ 16.33