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Subsequent Events - Equity (Details) - $ / shares
1 Months Ended 3 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Equity      
Dividends declared and paid per common share (in dollars per share)   $ 0.57 $ 0.57
Common Stock | Dividend Payable, April 2019 | Subsequent Event      
Equity      
Dividends declared and paid per common share (in dollars per share) $ 0.19    
Common Stock | Dividend Payable, May 2019 | Subsequent Event      
Equity      
Dividends declared and paid per common share (in dollars per share) 0.19    
Common Stock | Dividend Payable, June 28, 2019 | Subsequent Event      
Equity      
Dividends declared and paid per common share (in dollars per share) $ 0.19