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Stockholders' Equity (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2017 | May 14, 2018 | Feb. 14, 2018 | Nov. 30, 2017 | Jan. 12, 2016 | Jul. 17, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Common stock reserve (in shares) | 12,602,735 |  | 12,602,735 |  |  |  |  |  |
Additional shares authorized to be repurchased (in shares) |  |  |  |  | 2,373,000 |  |  |  |
Stock repurchases |  |  | $ 6,787 | $ 2,543 |  |  |  |  |
Dividend paid in each quarter (in dollars per share) | $ 0.0250 | $ 0.0250 | $ 0.05 | $ 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) | 4,000,000 |  | 4,000,000 |  |  |  |  | 10,000,000 |
Stock repurchases |  |  | $ 85,900 |  |  |  |  |  |
Common stock repurchased (in shares) |  |  | 8,373,000 |  |  |  |  |  |
Shares Withheld to Pay Taxes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchases |  |  | $ 6,800 |  |  |  |  |  |
Common stock repurchased (in shares) |  |  | 217,006 |  |  |  |  |  |
PSU 2014 [Domain] | Performance Shares [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  |  |  |  | 437,689 |  |  |
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
Convertible Notes Payable [Member] | Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior notes, rate | 1.375% |  | 1.375% |  |  |  | 1.375% |  |

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