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Changes in Capital Structure - Dividends (Details) - $ / shares
3 Months Ended 6 Months Ended
Sep. 15, 2020
Sep. 01, 2020
Aug. 03, 2020
Jul. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Class of Stock [Line Items]                    
Preferred stock, authorized (in shares)         10,000,000     10,000,000   10,000,000
Par value - preferred stock (in usd per share)         $ 0.01     $ 0.01   $ 0.01
Subsequent Event                    
Class of Stock [Line Items]                    
Dividends payable, date declared       Jul. 30, 2020            
Common stock, dividends, per share, declared (in dollars per share)     $ 0.3125 $ 0.3125            
Dividends payable, date to be paid Sep. 15, 2020                  
Dividends payable, date of record   Sep. 01, 2020                
Common Class A                    
Class of Stock [Line Items]                    
Common stock, dividends, per share, cash paid (in dollars per share)         0.21 $ 0.21 $ 0.20 0.42 $ 0.40  
Common Class C                    
Class of Stock [Line Items]                    
Common stock, dividends, per share, cash paid (in dollars per share)         $ 0.21 $ 0.21 $ 0.20 $ 0.42 $ 0.40