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Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |
Revenues (in dollars) | $ 22,298 | $ 21,429 | $ 21,180 | $ 20,253 | $ 19,820 | $ 18,359 | $ 17,925 | $ 17,592 | $ 85,160 | $ 73,696 | $ 68,794
Net income from discontinued operations (in dollars) | (32) | (30) | (74) | (94) | 256 | 25 | (43) | (45) | (230) | 193 | (113)
Net income available to common stockholders (in dollars) | $ 11,656 | $ 11,472 | $ 11,311 | $ 5,393 | $ 9,583 | $ 5,571 | $ 7,739 | $ 6,694 | $ 39,832 | $ 29,587 | $ 29,410
Net income per common share from continuing operations allocable to common stockholders: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.39 | $ 0.38 | $ 0.38 | $ 0.21 | $ 0.36 | $ 0.22 | $ 0.33 | $ 0.29 | $ 1.37 | $ 1.20 | $ 1.28
Diluted (in dollars per share) | $ 0.39 | $ 0.38 | $ 0.38 | $ 0.21 | $ 0.36 | $ 0.22 | $ 0.33 | $ 0.29 | $ 1.37 | $ 1.20 | $ 1.28
Net (loss) income per common share from discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.01 | $ 0.00 | $ 0.00 | $ 0.00 | $ (0.01) | $ 0.01 |
Diluted (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ (0.01) | $ 0.01 | $ 0.00 | $ 0.00 | $ 0.00 | $ (0.01) | $ 0.01 |
Net income per common share available to common stockholders: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.39 | $ 0.38 | $ 0.38 | $ 0.20 | $ 0.37 | $ 0.22 | $ 0.33 | $ 0.29 | $ 1.36 | $ 1.21 | $ 1.27
Diluted (in dollars per share) | $ 0.39 | $ 0.38 | $ 0.37 | $ 0.20 | $ 0.37 | $ 0.22 | $ 0.33 | $ 0.29 | $ 1.36 | $ 1.21 | $ 1.27
Dividends per share declared (in dollars per share) | $ 0.42 | $ 0.42 | $ 0.42 | $ 0.42 | $ 0.41 | $ 0.39 | $ 0.39 | $ 0.39 |  |  |
Dividend per share paid(in dollars per share) | $ 0.42 | $ 0.42 | $ 0.42 | $ 0.42 | $ 0.41 | $ 0.39 | $ 0.39 | $ 0.39 | $ 1.68 | $ 1.58 | $ 1.56

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