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Dividends and Distributions (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 5 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2020
Jan. 31, 2020
Jan. 31, 2019
Apr. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Apr. 30, 2020
Apr. 30, 2019
Dividends Payable [Line Items]                    
Dividend Per Share (in USD per share)       $ 0.2000 $ 0.1875 $ 0.2000 $ 0.21 $ 0.20    
Common Shares                    
Distributions Declared       $ 0 $ 0 $ 30,235       $ 30,235
Distributions Paid       38,796 28,218 $ 0       $ 28,098
Dividend equivalents accrued on unvested restricted stock units to be paid when the awards vest.                    
Common Shares                    
Distributions Paid $ 169 $ 127                
Dividend equivalents paid on unvested restricted stock units that are not expected to vest (recognized as additional compensation).                    
Common Shares                    
Distributions Paid       $ 4 $ 7          
Subsequent Event                    
Dividends Payable [Line Items]                    
Dividend Per Share (in USD per share)     $ 0.2100              
Common Shares                    
Distributions Declared     $ 42,568           $ 42,568  
Distributions Paid     $ 0           $ 38,631