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Stockholders' Equity (Summary of Regular Quarterly Dividend) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividend (in usd per share) | $ 0.90 | $ 0.90 | $ 0.75 | $ 0.75 | $ 0.75 | $ 0.65 | $ 0.65 | $ 2.55 |  | $ 2.80
Payment of dividends |  |  |  |  |  |  |  | $ 64,425 | $ 51,535 |
Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Payment of dividends | $ 22,747 | $ 22,739 | $ 18,939 | $ 18,866 | $ 18,865 | $ 16,349 | $ 16,321 | $ 64,425 |  | $ 70,401

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