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Stockholders' Equity (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2019 | May 31, 2018 | May 31, 2019 | May 31, 2018 | Feb. 15, 2019 | Feb. 01, 2019 | Jul. 17, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.0250 | $ 0.025 | $ 0.05 | $ 0.05 |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  | $ 3,345 | $ 6,787 |  |  |
Dividend paid in each quarter (in dollars per share) | $ 0.0250 | $ 0.025 | $ 0.050 | $ 0.05 |  |  |
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) |  |  | 147,382 |  |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  | $ 3,300 |  |  |  |
PSU 2014 [Domain] | Performance Shares [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  |  |  | 297,260 |  |
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% |

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