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Net Income Per Share (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Preferred Stock, Liquidation Preference Per Share $ 1,000       $ 1,000  
Payments for Repurchase of Preferred Stock and Preference Stock         $ 61,600,000 $ 0
Preferred Stock Dividends and Other Adjustments $ 41,900,000 $ 0 $ 0 $ 0 41,900,000 $ 0
Series B Preferred Stock [Member]            
Payments for Repurchase of Preferred Stock and Preference Stock         $ 60,000,000  
Preferred Series B [Member]            
Stock Repurchased and Retired During Period, Shares         62,854  
Stock Repurchase Price per Share         $ 954.59  
Preferred Stock, Liquidation Amount per Share 1,272.78       1,272.78  
Preferred Stock, Carrying Value per Share $ 43.80       $ 43.80  
Preferred Stock, Liquidation Preference Per Share $ 1,000.00       $ 1,000.00  
Payments for Repurchase of Preferred Stock and Preference Stock         $ 60,000,000  
Preferred Stock Dividends and Other Adjustments         $ 41,900,000