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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2012
Schedule of Earnings Per Share Basic and Diluted |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Numerator—basic and diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 7,747 |  |  | $ | 15,325 |  |  | $ | 26,178 |  |  | $ | 34,583 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding—basic |  |  | 40,592 |  |  |  | 40,587 |  |  |  | 40,475 |  |  |  | 42,223 |
Effect of dilutive stock options |  |  | 646 |  |  |  | 949 |  |  |  | 804 |  |  |  | 918 |
Effect of dilutive convertible notes |  |  | 229 |  |  |  | 836 |  |  |  | 737 |  |  |  | 759 |
Effect of dilutive restricted shares |  |  | 607 |  |  |  | 540 |  |  |  | 656 |  |  |  | 520 |
Weighted average number of common shares outstanding—diluted |  |  | 42,074 |  |  |  | 42,912 |  |  |  | 42,672 |  |  |  | 44,420 |
Earnings per common share—basic |  | $ | 0.19 |  |  | $ | 0.38 |  |  | $ | 0.65 |  |  | $ | 0.82 |
Earnings per common share—diluted |  | $ | 0.18 |  |  | $ | 0.36 |  |  | $ | 0.61 |  |  | $ | 0.78 |
Antidilutive stock options and restricted shares |  |  | 3,530 |  |  |  | 2,162 |  |  |  | 2,806 |  |  |  | 2,091 |

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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_
Data Type: | nonnum:textBlockItemType
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