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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Earnings Per Share [Abstract] |
Components of basic and diluted earnings per common share |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Net income attributable to common stockholders - Basic |  | $ | 9,806 |  |  | $ | 17,917 |  |  | $ | 26,590 |  |  | $ | 25,549 |
Impact of assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on convertible notes |  |  | 414 |  |  |  | 867 |  |  |  | — |  |  |  | — |
Dividends on preferred stock |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 140 |
Net income attributable to common stockholders - Diluted |  | $ | 10,220 |  |  | $ | 18,784 |  |  | $ | 26,590 |  |  | $ | 25,689 |
Weighted average common shares outstanding - Basic |  |  | 48,384 |  |  |  | 47,178 |  |  |  | 48,054 |  |  |  | 43,201 |
Assumed conversions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental common shares from warrants |  |  | 1,493 |  |  |  | 1,727 |  |  |  | 1,617 |  |  |  | 2,388 |
Incremental common shares from stock options |  |  | 1,003 |  |  |  | 743 |  |  |  | 986 |  |  |  | 743 |
Incremental common shares from convertible preferred stock before conversion |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 581 |
Incremental common shares from restricted stock units |  |  | 158 |  |  |  | — |  |  |  | 80 |  |  |  | — |
Incremental common shares from convertible senior notes |  |  | 2,440 |  |  |  | 4,681 |  |  |  | — |  |  |  | — |
Weighted average common shares outstanding - Diluted |  |  | 53,478 |  |  |  | 54,329 |  |  |  | 50,737 |  |  |  | 46,913 |
Basic earnings per common share |  | $ | 0.20 |  |  | $ | 0.38 |  |  | $ | 0.55 |  |  | $ | 0.59 |
Diluted earnings per common share |  | $ | 0.19 |  |  | $ | 0.35 |  |  | $ | 0.52 |  |  | $ | 0.55 |

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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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