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Stockholders' Equity (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 15, 2017 | Feb. 28, 2017 | Feb. 29, 2016 | Nov. 30, 2016
Debt Instrument [Line Items] |  |  |  |
Common stock reserve (in shares) |  | 12,602,735 |  |
Stock repurchases |  | $ 2,543 | $ 87,526 |
Dividend paid in each quarter (in dollars per share) |  | $ 0.0250 | $ 0.0250 |
Cash dividends declared per common share (in dollars per share) |  | $ 0.0250 | $ 0.0250 |
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) |  | 1,627,000 |  |
Shares Withheld to Pay Taxes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stock repurchases |  | $ 2,543 |  |
Treasury Stock, Shares, Acquired (in shares) |  | 152,569 |  |
PSU 2013 [Domain] | Performance Shares [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Common Stock, Shares, Issued (in shares) | 278,460 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 125,460 |  |  |
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%

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