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Stockholders' Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Thousands | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017
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Share-based Payment Arrangement [Abstract] |  |  |  |  |  |  |  |
Dividend per Share (in dollars per share) | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08
Total of Cash Dividends Declared | $ 12,724 | $ 12,681 | $ 12,706 | $ 13,226 | $ 13,677 | $ 13,991 | $ 14,272 | $ 14,588

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