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Selected Quarterly Financial Data (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 136,603 | $ 113,277 | $ 100,748 | $ 98,077 | $ 97,295 | $ 81,164 | $ 81,008 | $ 80,704 | $ 450,017 | $ 340,113 | $ 297,399
Net income | 38,599 | 29,996 | 51,048 | 31,776 | 33,864 | 28,078 | 24,559 | 29,984 | 151,419 | 116,485 | 109,715
Per share data: |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.24 | $ 0.20 | $ 0.36 | $ 0.22 | $ 0.26 | $ 0.22 | $ 0.19 | $ 0.24 |  |  |
Common distributions declared (in dollars per share) | $ 0.38 | $ 0.38 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.36 | $ 0.36 |  |  |
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Total revenues | 136,603 | 113,277 | 100,748 | 98,077 | 97,295 | 81,164 | 81,008 | 80,704 | 450,017 | 340,113 | 297,399
Previously reported |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Revenues |  | 113,277 | 100,748 | 98,077 | 97,295 | 81,164 | 81,008 | 80,704 |  |  |
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | 113,277 | 100,748 | 98,077 | 97,295 | 81,164 | 81,008 | 80,704 |  |  |
Reclassifications |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Revenues |  | 423 | 414 | 475 | 68 | (150) | (30) | 54 |  |  |
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | 423 | 414 | 475 | 68 | (150) | (30) | 54 |  |  |
Restated |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Revenues |  | 113,700 | 101,162 | 98,552 | 97,363 | 81,014 | 80,978 | 80,758 |  |  |
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ 113,700 | $ 101,162 | $ 98,552 | $ 97,363 | $ 81,014 | $ 80,978 | $ 80,758 |  |  |

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