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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
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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per share (in usd per share) | $ 0.65 | $ 0.65 | $ 0.65 | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.55 | $ 0.55 | $ 0.50 | $ 0.50 | $ 0.50 | $ 2.55 | $ 2.35 | $ 2.05
Payment of dividends |  |  |  |  |  |  |  |  |  |  |  |  | $ 63,813 | $ 59,270 | $ 51,057
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of dividends | $ 16,280 | $ 16,267 | $ 16,267 | $ 14,999 | $ 15,156 | $ 15,129 | $ 15,127 | $ 13,858 | $ 13,711 | $ 12,459 | $ 12,445 | $ 12,442 | $ 63,813 | $ 59,270 | $ 51,057

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