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Stockholders' Equity (Dividends on Common Stock) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 17, 2020
Aug. 06, 2020
Dec. 12, 2019
Sep. 12, 2019
Jun. 12, 2019
Mar. 06, 2019
Dec. 12, 2018
Sep. 13, 2018
Jun. 07, 2018
Mar. 07, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 11, 2020
Share-based Payment Arrangement [Abstract]                            
Dividend declared, never paid (in dollars per share)                           $ 0.20
Common stock, cash dividends declared (in dollars per share) $ 0.075 $ 0.05 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.125 $ 0.80 $ 0.80  
Dividends and dividend equivalents declared and unpaid $ 34,000                   $ 34,016 $ 90,749 $ 90,198  
Return of capital (in dollars per share)                     $ 0.05      
Common stock dividends, capital gains (in dollars per share)                       $ 0.1672 $ 0.1290