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Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 267,519 | $ 255,275 | $ 247,402 | $ 228,577 | $ 229,809 | $ 216,873 | $ 206,708 | $ 191,497 | $ 998,773 | $ 844,887 | $ 761,438
Net income | $ 9,544 | $ 38,249 | $ 36,387 | $ 39,789 | $ 45,288 | $ 37,112 | $ 37,659 | $ 38,580 | 123,968 | $ 158,637 | $ 151,164
Per share data (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.04 | $ 0.16 | $ 0.15 | $ 0.18 | $ 0.22 | $ 0.18 | $ 0.19 | $ 0.21 |  |  |
Common distributions declared (in dollars per share) | $ 0.52 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 |  |  |
Loss on distribution to common shareholders of The RMR Group Inc. common stock |  |  |  |  |  |  |  |  | $ (38,437) |  |

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