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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Schedule of Earnings Per Share Basic and Diluted |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Numerator—basic and diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 23,486 |  |  | $ | 7,747 |  |  | $ | 47,166 |  |  | $ | 26,178 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding—basic |  |  | 39,143 |  |  |  | 40,592 |  |  |  | 39,272 |  |  |  | 40,475 |
Effect of dilutive stock options |  |  | 589 |  |  |  | 646 |  |  |  | 592 |  |  |  | 804 |
Effect of dilutive convertible notes |  |  | — |  |  |  | 229 |  |  |  | — |  |  |  | 737 |
Effect of dilutive restricted shares |  |  | 561 |  |  |  | 607 |  |  |  | 592 |  |  |  | 656 |
Weighted average number of common shares outstanding—diluted |  |  | 40,293 |  |  |  | 42,074 |  |  |  | 40,456 |  |  |  | 42,672 |
Earnings per common share—basic |  | $ | 0.60 |  |  | $ | 0.19 |  |  | $ | 1.20 |  |  | $ | 0.65 |
Earnings per common share—diluted |  | $ | 0.58 |  |  | $ | 0.18 |  |  | $ | 1.17 |  |  | $ | 0.61 |
Antidilutive stock options and restricted shares |  |  | 3,593 |  |  |  | 3,530 |  |  |  | 3,541 |  |  |  | 2,806 |

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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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