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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Earnings Per Share, Basic and Diluted | The calculation and reconciliation of basic and diluted earnings per share for the years ended December 31 (in thousands, except per share data):
|  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 216,199 |  |  | $ | 147,335 |  |  | $ | 107,896 |
Convertible preferred stock accrued dividends |  |  | — |  |  |  | — |  |  |  | (1,488 | )
Earnings attributable to common shareholders for basic earnings per share |  | $ | 216,199 |  |  | $ | 147,335 |  |  | $ | 106,408 |
Numerator for diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to common shareholders for basic earnings per share |  | $ | 216,199 |  |  | $ | 147,335 |  |  | $ | 106,408 |
Effect of convertible preferred stock |  |  | — |  |  |  | — |  |  |  | 1,488 |
Net earnings for diluted earnings per share |  | $ | 216,199 |  |  | $ | 147,335 |  |  | $ | 107,896 |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  |  | 82,553 |  |  |  | 79,477 |  |  |  | 33,704 |
Share-based payment awards classified as participating securities |  |  | 775 |  |  |  | 1,133 |  |  |  | 1,730 |
Denominator for basic earnings per share |  |  | 83,328 |  |  |  | 80,610 |  |  |  | 35,434 |
Dilutive securities |  |  | 2,408 |  |  |  | 3,044 |  |  |  | 3,055 |
Convertible preferred stock |  |  | — |  |  |  | — |  |  |  | 42,262 |
Denominator for diluted earnings per share |  |  | 85,736 |  |  |  | 83,654 |  |  |  | 80,751 |
Basic earnings per share |  | $ | 2.59 |  |  | $ | 1.83 |  |  | $ | 3.00 |
Diluted earnings per share |  |  | 2.52 |  |  |  | 1.76 |  |  |  | 1.34 |

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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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