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Stockholders' Equity (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 08, 2020 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2020 | Aug. 31, 2019 | Feb. 20, 2020 | Feb. 01, 2019 | Jul. 17, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  | $ 0.09 | $ 0.09 | $ 0.27 | $ 0.14 |  |  |
Payment, Tax Withholding, Share-based Payment Arrangement |  |  |  | $ 6,219 | $ 3,345 |  |  |
Dividend paid in each quarter (in dollars per share) |  | $ 0.09 | $ 0.09 | $ 0.27 | $ 0.14 |  |  |
January 2016 Stock Repurchase Program [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of common stock, authorized, approved under a board approved stock repurchase program (in shares) |  | 2,193,947 |  | 2,193,947 |  |  |  |
Shares Withheld to Pay Taxes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Common stock repurchased (in shares) |  |  |  | 155,307 |  |  |  |
Payment, Tax Withholding, Share-based Payment Arrangement |  |  |  | $ 6,200 |  |  |  |
PSU 2014 [Domain] | Performance Shares [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  |  |  |  | 313,246 |  |
Director Plan SARs [Domain] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of common stock, authorized, approved under a board approved stock repurchase program (in shares) |  |  |  |  |  |  |  | 680,000
2014 Equity Incentive Plan [Domain] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 680,000 |  | 680,000 |  |  |  |
Convertible Notes Payable [Member] | 1.375% Convertible senior notes due February 1, 2019 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes, rate |  |  |  |  |  |  | 1.375% |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.15 |  |  |  |  |  |  |

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