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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
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Selected Quarterly Financial Data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 194,164 | $ 158,633 | $ 146,972 | $ 145,073 | $ 136,603 | $ 113,700 | $ 101,162 | $ 98,552 | $ 644,842 | $ 450,017 | $ 340,113
Net income | $ 44,636 | $ 25,646 | $ 33,251 | $ 32,352 | $ 38,599 | $ 29,996 | $ 51,048 | $ 31,776 | $ 135,884 | $ 151,419 | $ 116,485
Per share data: |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.25 | $ 0.15 | $ 0.20 | $ 0.20 | $ 0.24 | $ 0.20 | $ 0.36 | $ 0.22 |  |  |
Common distributions declared (in dollars per share) | $ 0.39 | $ 0.39 | $ 0.38 | $ 0.38 | $ 0.38 | $ 0.38 | $ 0.37 | $ 0.37 |  |  |

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