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Stockholders' Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Thousands | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016
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Disclosure of Compensation Related Costs, Share-based Payments [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 | $ 13,677 | $ 13,991 | $ 14,272 | $ 14,588 | $ 14,698 | $ 14,840 | $ 15,051 | $ 15,248

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