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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2011
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | For the Years Ended December 31, |  |
(Amounts in thousands, except share and per share amounts) | 2011 |  | 2010 |  | 2009 |  |
| Net income attributable to common stockholders – basic and diluted | $ | 79,423 |  | $ | 66,429 |  | $ | 132,190 |  |
| Weighted average shares outstanding – basic |  | 5,106,568 |  |  | 5,105,936 |  |  | 5,103,790 |  |
| Dilutive effect of stock options |  | - |  |  | - |  |  | 1,580 |  |
| Weighted average shares outstanding – diluted |  | 5,106,568 |  |  | 5,105,936 |  |  | 5,105,370 |  |
| Net income per common share – basic | $ | 15.55 |  | $ | 13.01 |  | $ | 25.90 |  |
| Net income per common share – diluted | $ | 15.55 |  | $ | 13.01 |  | $ | 25.89 |  |

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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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