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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per share (in usd per share) | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.55 | $ 0.55 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.30 | $ 0.30 | $ 0.30 | $ 2.35 | $ 2.05 | $ 1.40
Payment of dividends |  |  |  |  |  |  |  |  |  |  |  |  | $ 59,270 | $ 51,057 | $ 34,437
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of dividends | $ 15,156 | $ 15,129 | $ 15,127 | $ 13,858 | $ 13,711 | $ 12,459 | $ 12,445 | $ 12,442 | $ 12,359 | $ 7,371 | $ 7,363 | $ 7,344 | $ 59,270 | $ 51,057 | $ 34,437

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