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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Computation of basic and diluted net income per share | Basic earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Except where the result would be anti-dilutive, dilutive earnings per share is calculated by assuming the vesting of unvested restricted stock and the exercise of stock options, as well as their related income tax benefits. The following table reconciles the numerator and the denominator used to calculate basic and diluted earnings per share:
|  | Three months ended September 30, |  |  | Six months ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Numerator- net income |  | $ | 47,093 |  |  | $ | 25,541 |  |  | $ | 126,021 |  |  | $ | 64,936 |
Denominator- weighted average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 68,198,006 |  |  |  | 67,415,363 |  |  |  | 68,026,705 |  |  |  | 67,308,758 |
Dilutive effect of stock compensation awards (1) |  |  | 1,689,019 |  |  |  | 1,751,138 |  |  |  | 1,600,510 |  |  |  | 1,672,212 |
Diluted |  |  | 69,887,025 |  |  |  | 69,166,501 |  |  |  | 69,627,215 |  |  |  | 68,980,970 |
Net income per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.69 |  |  | $ | 0.38 |  |  | $ | 1.85 |  |  | $ | 0.96 |
Diluted |  | $ | 0.67 |  |  | $ | 0.37 |  |  | $ | 1.81 |  |  | $ | 0.94 |
(1) Excludes approximately 8,000 and 18,000 stock options for the three and nine month periods ended September 30, 2013, respectively, as the impact of such awards was anti-dilutive. Excludes approximately 2,000 and 259,000 stock options for the three and nine month periods ended September 30, 2012, respectively, as the impact of such awards was anti-dilutive.

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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