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Summary of Quarterly results (Tables) | 12 Months Ended
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Dec. 31, 2011
Summary of Quarterly Results [Abstract] |
Summary of Quarterly Results (Unaudited) [Table Text Block] |
|  |  |  |  |  | Net Income |  |  |
|  |  |  |  |  | Attributable to |  | Income Per |
|  |  |  |  |  | Common |  | Common Share(1) |
| (Amounts in thousands, except per share amounts) | Revenues |  | Stockholders |  | Basic |  | Diluted |
| 2011 |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31 | $ | 64,607 |  | $ | 20,634 |  | $ | 4.04 |  | $ | 4.04 |
|  | September 30 |  | 64,737 |  |  | 20,425 |  |  | 4.00 |  |  | 4.00 |
|  | June 30 |  | 62,036 |  |  | 20,157 |  |  | 3.95 |  |  | 3.95 |
|  | March 31 |  | 62,872 |  |  | 18,207 |  |  | 3.57 |  |  | 3.57 |
| 2010 |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31 | $ | 62,250 |  | $ | 17,891 |  | $ | 3.50 |  | $ | 3.50 |
|  | September 30 |  | 61,390 |  |  | 17,875 |  |  | 3.50 |  |  | 3.50 |
|  | June 30 |  | 59,166 |  |  | 15,549 |  |  | 3.05 |  |  | 3.05 |
|  | March 31 |  | 58,544 |  |  | 15,114 |  |  | 2.96 |  |  | 2.96 |
_______________________ |  |  |  |  |  |  |  |  |  |  |  |
(1) | The total for the year may differ from the sum of the quarters as a result of weighting.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 270 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a)-(j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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