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Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Earnings per Share |  |  |  |  |  |  |  |
Income from continuing operations | $ 12,504 |  | $ 12,448 |  | $ 38,533 |  | $ 36,914 |
Less net income allocated to non-controlling interests | (9) |  | (48) |  | (30) |  | (144) |
Less net income allocated to participating securities: |  |  |  |  |  |  |  |
Nonforfeitable dividends on participating securities | (94) |  | (85) |  | (279) |  | (259) |
Total net income allocated to participating securities | (94) |  | (85) |  | (279) |  | (259) |
Less net income allocated to preferred stockholders: |  |  |  |  |  |  |  |
Preferred stock dividends | (818) |  | (818) |  | (2,454) |  | (4,694) |
Preferred stock redemption charge |  |  |  |  |  |  | (3,566) |
Total net income allocated to preferred stockholders | (818) |  | (818) |  | (2,454) |  | (8,260) |
Income from continuing operations available to common stockholders | 11,583 |  | 11,497 |  | 35,770 |  | 28,251 |
Discontinued operations: |  |  |  |  |  |  |  |
Loss from discontinued operations |  |  | (25) |  |  |  | (75) |
Gain on sale of assets, net |  |  |  |  | 16 |  |  |
Net (loss) gain from discontinued operations |  |  | (25) |  | 16 |  | (75) |
Net income available to common stockholders | 11,583 |  | 11,472 |  | 35,786 |  | 28,176 |
Net income for diluted net income per share | $ 11,583 |  | $ 11,472 |  | $ 35,786 |  | $ 28,176 |
Shares for basic net income per share | 30,253 |  | 30,137 |  | 30,219 |  | 28,874 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options (in shares) | 40 |  | 19 |  | 44 |  | 28 |
Shares for diluted net income per share | 30,293 |  | 30,156 |  | 30,263 |  | 28,902 |
Basic net income per share (in dollars per share) | $ 0.38 | [1] | $ 0.38 | [1] | $ 1.18 | [1] | $ 0.98 | [1]
Diluted net income per share (in dollars per share) | $ 0.38 | [1],[2] | $ 0.38 | [1],[2] | $ 1.18 | [1],[2] | $ 0.97 | [1],[2]
[1] | NOTE: Computations of per share amounts from continuing operations, discontinued operations and net income are made independently. Therefore, the sum of per share amounts from continuing operations and discontinued operations may not agree with the per share amounts from net income available to common stockholders.
[2] | For the three and nine months ended September 30, 2012 and 2011, the Series C Cumulative Convertible Preferred Stock, the participating securities and the non-controlling interest have been excluded from the computation of diluted net income per share as such inclusion would be anti-dilutive.

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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