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Stockholders' Equity (Schedule of Quarterly Dividends Declared and Paid) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]                              
Dividends paid per share (in usd per share) $ 0.75 $ 0.75 $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 0.65 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.55 $ 2.80 $ 2.55 $ 2.35
Payment of dividends                         $ 70,401 $ 63,813 $ 59,270
Common Stock                              
Class of Stock [Line Items]                              
Payment of dividends $ 18,866 $ 18,865 $ 16,349 $ 16,321 $ 16,280 $ 16,267 $ 16,267 $ 14,999 $ 15,156 $ 15,129 $ 15,127 $ 13,858 $ 70,401 $ 63,813 $ 59,270