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Earnings Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Schedule of Earnings Per Share Basic and Diluted |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Numerator—basic and diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 22,713 |  |  | $ | 29,439 |  |  | $ | 48,891 |  |  | $ | 64,022 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding—basic |  |  | 40,387 |  |  |  | 40,182 |  |  |  | 40,446 |  |  |  | 41,535 |
Effect of dilutive stock options |  |  | 160 |  |  |  | 884 |  |  |  | 590 |  |  |  | 895 |
Effect of dilutive convertible notes |  |  | — |  |  |  | 647 |  |  |  | 224 |  |  |  | 722 |
Effect of dilutive restricted shares |  |  | 555 |  |  |  | 554 |  |  |  | 622 |  |  |  | 519 |
Weighted average number of common shares outstanding—diluted |  |  | 41,102 |  |  |  | 42,267 |  |  |  | 41,882 |  |  |  | 43,671 |
Earnings per common share—basic |  | $ | 0.56 |  |  | $ | 0.73 |  |  | $ | 1.21 |  |  | $ | 1.54 |
Earnings per common share—diluted |  | $ | 0.55 |  |  | $ | 0.70 |  |  | $ | 1.17 |  |  | $ | 1.47 |
Antidilutive stock options and restricted shares |  |  | 5,421 |  |  |  | 2,612 |  |  |  | 3,678 |  |  |  | 2,330 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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