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Earnings (Loss) Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Earnings Per Share Basic and Diluted |
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator — basic and diluted |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | (36,986 | ) |  | $ | 103,903 |  |  | $ | 65,984 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding — basic |  |  | 40,316 |  |  |  | 41,131 |  |  |  | 45,557 |
Effect of dilutive stock options |  |  | — |  |  |  | 915 |  |  |  | 915 |
Effect of dilutive convertible notes |  |  | — |  |  |  | 836 |  |  |  | 863 |
Effect of dilutive restricted shares |  |  | — |  |  |  | 591 |  |  |  | 329 |
Weighted average number of common shares outstanding — diluted |  |  | 40,316 |  |  |  | 43,473 |  |  |  | 47,664 |
Earnings (loss) per common share — basic |  | $ | (0.92 | ) |  | $ | 2.53 |  |  | $ | 1.45 |
Earnings (loss) per common share — diluted |  | $ | (0.92 | ) |  | $ | 2.39 |  |  | $ | 1.38 |
Antidilutive stock options and restricted shares |  |  | 4,943 |  |  |  | 2,119 |  |  |  | 1,606 |

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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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