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Earnings Per Common Share Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | The following table sets forth the computation of basic and diluted earnings per common share fo r the quarters ended March 31, 2013 and 2012 (amounts in thousands, except per share data):
| Quarters Ended March 31,
| 2013 |  | 2012
Numerators: |  |  |
Net Income Available for Common Shares – Fully Diluted: |  |  |
Net income available for Common Shares – basic | $ | 35,024 |  |  | $ | 12,431 |
Amounts allocated to dilutive securities | 3,133 |  |  | 1,191 |
Net income available for Common Shares – fully diluted | $ | 38,157 |  |  | $ | 13,622 |
Denominator: |  |  |
Weighted average Common Shares outstanding – basic | 41,513 |  |  | 41,088 |
Effect of dilutive securities: |  |  |
Redemption of Common OP Units for Common Shares | 3,729 |  |  | 3,980 |
Employee stock options and restricted shares | 288 |  |  | 301 |
Weighted average Common Shares outstanding – fully diluted | 45,530 |  |  | 45,369 |
Earnings per Common Share – Basic: |  |  |
Net income available for Common Shares | $ | 0.84 |  |  | $ | 0.30 |
Earnings per Common Share – Fully Diluted: |  |  |
Net income available for Common Shares | $ | 0.84 |  |  | $ | 0.30 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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