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Earnings Per Share (Tables) | 9 Months Ended
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Aug. 31, 2015
Earnings Per Share, Basic and Diluted [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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