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Earnings Per Share | 9 Months Ended
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Aug. 31, 2015
Earnings Per Share, Basic and Diluted [Abstract] |
Earnings Per Share | Earnings Per Share Basic and diluted earnings per share were calculated as follows (in thousands, except per share amounts):
| Nine Months Ended August 31, |  | Three Months Ended August 31,
| 2015 |  | 2014 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |  |
Net income | $ | 40,626 |  |  | $ | 65,548 |  |  | $ | 23,254 |  |  | $ | 28,361 |
Less: Distributed earnings allocated to nonvested restricted stock | (24 | ) |  | (18 | ) |  | (7 | ) |  | (6 | )
Less: Undistributed earnings allocated to nonvested restricted stock | (115 | ) |  | (159 | ) |  | (63 | ) |  | (73 | )
Numerator for basic earnings per share | 40,487 |  |  | 65,371 |  |  | 23,184 |  |  | 28,282 |
Effect of dilutive securities: |  |  |  |  |  |  |
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes | 2,000 |  |  | 2,000 |  |  | 667 |  |  | 667 |
Add: Undistributed earnings allocated to nonvested restricted stock | 115 |  |  | 159 |  |  | 63 |  |  | 73 |
Less: Undistributed earnings reallocated to nonvested restricted stock | (104 | ) |  | (142 | ) |  | (57 | ) |  | (66 | )
Numerator for diluted earnings per share | $ | 42,498 |  |  | $ | 67,388 |  |  | $ | 23,857 |  |  | $ | 28,956 |
| Nine Months Ended August 31, |  | Three Months Ended August 31,
| 2015 |  | 2014 |  | 2015 |  | 2014
Denominator: |  |  |  |  |  |  |
Weighted average shares outstanding — basic | 92,005 |  |  | 88,389 |  |  | 92,065 |  |  | 91,793 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based payments | 1,198 |  |  | 1,823 |  |  | 1,407 |  |  | 1,875 |
Convertible senior notes | 8,402 |  |  | 8,402 |  |  | 8,402 |  |  | 8,402 |
Weighted average shares outstanding — diluted | 101,605 |  |  | 98,614 |  |  | 101,874 |  |  | 102,070 |
Basic earnings per share | $ | .44 |  |  | $ | .74 |  |  | $ | .25 |  |  | $ | .31 |
Diluted earnings per share | $ | .42 |  |  | $ | .68 |  |  | $ | .23 |  |  | $ | .28 |
We compute earnings per share using the two-class method, which is an allocation of earnings between the holders of common stock and a company’s participating security holders. Our outstanding nonvested shares of restricted stock contain non-forfeitable rights to dividends and, therefore, are considered participating securities for purposes of computing earnings per share pursuant to the two-class method. We had no other participating securities at August 31, 2015 or 2014. Outstanding stock options to purchase 5.7 million shares of our common stock were excluded from the diluted earnings per share calculations for the three-month and nine-month periods ended August 31, 2015, and outstanding stock options to purchase 5.2 million shares of our common stock were excluded from the diluted earnings per share calculations for the three-month and nine-month periods ended August 31, 2014, because the effect of their inclusion in each case would be antidilutive. Contingently issuable shares associated with outstanding performance-based restricted stock units (each a “PSU”) were not included in the earnings per share calculations for the three-month and nine-month periods ended August 31, 2015 and 2014, as the applicable vesting conditions had not been satisfied.

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