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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 4 |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | $ 681,022 | $ 666,200 | $ 630,899
Residents fees and services |  |  |  |  |  |  |  |  | 393,797 | 391,822 | 367,874
Total revenues | $ 278,566 | $ 266,679 | $ 265,013 | $ 264,561 | $ 274,296 | $ 263,983 | $ 261,367 | $ 258,375 | 1,074,819 | 1,058,022 | 998,773
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 413,430 | 399,790 | 377,579
Depreciation and amortization |  |  |  |  |  |  |  |  | 276,861 | 287,831 | 257,783
General and administrative |  |  |  |  |  |  |  |  | 103,702 | 46,559 | 42,830
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 547 | 2,085 | 6,853
Impairment of assets |  |  |  |  |  |  |  |  | 5,082 | 18,674 | 194
Total expenses |  |  |  |  |  |  |  |  | 799,622 | 754,939 | 685,239
Operating income |  |  |  |  |  |  |  |  | 275,197 | 303,083 | 313,534
Dividend income |  |  |  |  |  |  |  |  | 2,637 | 2,108 | 2,773
Interest and other income |  |  |  |  |  |  |  |  | 406 | 430 | 379
Interest expense |  |  |  |  |  |  |  |  | (165,019) | (167,574) | (150,881)
Loss on distribution to common shareholders of The RMR Group Inc. common stock |  |  |  |  |  |  |  |  | 0 | 0 | (38,437)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (7,627) | (526) | (1,894)
Income from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | 105,594 | 137,521 | 125,474
Income tax expense |  |  |  |  |  |  |  |  | (454) | (424) | (574)
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 608 | 137 | 20
Income before gain on sale of properties | 65,000 | $ 34,414 | $ 16,042 | $ 32,155 | 42,885 | $ 27,903 | $ 39,233 | $ 31,272 | 105,748 | 137,234 | 123,968
Income from continuing operations |  |  |  |  |  |  |  |  | 105,748 | 137,234 | 124,920
Gain on sale of properties |  |  |  |  |  |  |  |  | 46,055 | 4,061 | 0
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | (350)
Loss on impairment of assets from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | (602)
Net income (loss) |  |  |  |  |  |  |  |  | 151,803 | 141,295 | 123,968
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (4,193) | 0 | 0
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | 147,610 | 141,295 | 123,968
Total assets | 7,294,019 |  |  |  | 7,227,754 |  |  |  | 7,294,019 | 7,227,754 | 7,160,090
Triple Net Leased Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | 280,641 | 275,697 | 256,035
Residents fees and services |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  | 280,641 | 275,697 | 256,035
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 0 | 833 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 81,976 | 78,361 | 70,417
General and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  | 0 | 6,583 | 194
Total expenses |  |  |  |  |  |  |  |  | 81,976 | 85,777 | 70,611
Operating income |  |  |  |  |  |  |  |  | 198,665 | 189,920 | 185,424
Dividend income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest and other income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | (8,855) | (24,795) | (25,015)
Loss on distribution to common shareholders of The RMR Group Inc. common stock |  |  |  |  |  |  |  |  |  |  | 0
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (7,294) | (467) | (6)
Income from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | 182,516 | 164,658 | 160,403
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before gain on sale of properties |  |  |  |  |  |  |  |  | 182,516 | 164,658 |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 160,403
Gain on sale of properties |  |  |  |  |  |  |  |  | 45,901 | 4,061 |
Loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0
Loss on impairment of assets from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0
Net income (loss) |  |  |  |  |  |  |  |  | 228,417 | 168,719 | 160,403
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 |  |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | 228,417 |  |
Total assets | 2,251,756 |  |  |  | 2,289,045 |  |  |  | 2,251,756 | 2,289,045 | 2,251,212
Managed Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Residents fees and services |  |  |  |  |  |  |  |  | 393,797 | 391,822 | 367,874
Total revenues |  |  |  |  |  |  |  |  | 393,797 | 391,822 | 367,874
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 300,500 | 293,195 | 278,242
Depreciation and amortization |  |  |  |  |  |  |  |  | 62,266 | 81,482 | 60,600
General and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  | 0 | 2,174 | 0
Total expenses |  |  |  |  |  |  |  |  | 362,766 | 376,851 | 338,842
Operating income |  |  |  |  |  |  |  |  | 31,031 | 14,971 | 29,032
Dividend income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest and other income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | (4,685) | (8,540) | (9,973)
Loss on distribution to common shareholders of The RMR Group Inc. common stock |  |  |  |  |  |  |  |  |  |  | 0
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | (59) | (34)
Income from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | 26,346 | 6,372 | 19,025
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before gain on sale of properties |  |  |  |  |  |  |  |  | 26,346 | 6,372 |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 19,025
Gain on sale of properties |  |  |  |  |  |  |  |  | 0 | 0 |
Loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0
Loss on impairment of assets from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0
Net income (loss) |  |  |  |  |  |  |  |  | 26,346 | 6,372 | 19,025
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 |  |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | 26,346 |  |
Total assets | 1,273,757 |  |  |  | 1,260,032 |  |  |  | 1,273,757 | 1,260,032 | 1,260,425
MOBs |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | 382,127 | 372,233 | 356,586
Residents fees and services |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  | 382,127 | 372,233 | 356,586
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 112,930 | 105,762 | 99,337
Depreciation and amortization |  |  |  |  |  |  |  |  | 128,827 | 124,196 | 122,974
General and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  | 0 | 7,122 | 0
Total expenses |  |  |  |  |  |  |  |  | 241,757 | 237,080 | 222,311
Operating income |  |  |  |  |  |  |  |  | 140,370 | 135,153 | 134,275
Dividend income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest and other income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | (24,919) | (13,852) | (6,214)
Loss on distribution to common shareholders of The RMR Group Inc. common stock |  |  |  |  |  |  |  |  |  |  | 0
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (59) | 0 | (250)
Income from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | 115,392 | 121,301 | 127,811
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before gain on sale of properties |  |  |  |  |  |  |  |  | 115,392 | 121,301 |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 127,811
Gain on sale of properties |  |  |  |  |  |  |  |  | 0 | 0 |
Loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | (350)
Loss on impairment of assets from discontinued operations |  |  |  |  |  |  |  |  |  |  | (602)
Net income (loss) |  |  |  |  |  |  |  |  | 115,392 | 121,301 | 126,859
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (4,193) |  |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | 111,199 |  |
Total assets | 3,367,485 |  |  |  | 3,333,141 |  |  |  | 3,367,485 | 3,333,141 | 3,362,214
All Other Operations |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | 18,254 | 18,270 | 18,278
Residents fees and services |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  | 18,254 | 18,270 | 18,278
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,792 | 3,792 | 3,792
General and administrative |  |  |  |  |  |  |  |  | 103,702 | 46,559 | 42,830
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 547 | 2,085 | 6,853
Impairment of assets |  |  |  |  |  |  |  |  | 5,082 | 2,795 | 0
Total expenses |  |  |  |  |  |  |  |  | 113,123 | 55,231 | 53,475
Operating income |  |  |  |  |  |  |  |  | (94,869) | (36,961) | (35,197)
Dividend income |  |  |  |  |  |  |  |  | 2,637 | 2,108 | 2,773
Interest and other income |  |  |  |  |  |  |  |  | 406 | 430 | 379
Interest expense |  |  |  |  |  |  |  |  | (126,560) | (120,387) | (109,679)
Loss on distribution to common shareholders of The RMR Group Inc. common stock |  |  |  |  |  |  |  |  |  |  | (38,437)
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  | (274) | 0 | (1,604)
Income from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | (218,660) | (154,810) | (181,765)
Income tax expense |  |  |  |  |  |  |  |  | (454) | (424) | (574)
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 608 | 137 | 20
Income before gain on sale of properties |  |  |  |  |  |  |  |  | (218,506) | (155,097) |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | (182,319)
Gain on sale of properties |  |  |  |  |  |  |  |  | 154 | 0 |
Loss from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0
Loss on impairment of assets from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0
Net income (loss) |  |  |  |  |  |  |  |  | (218,352) | (155,097) | (182,319)
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 |  |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | (218,352) |  |
Total assets | $ 401,021 |  |  |  | $ 345,536 |  |  |  | $ 401,021 | $ 345,536 | $ 286,239

X
- Definition Amount of non cash loss, which represents difference between our carrying value and the fair value of the RMR Inc. shares on the distribution date + References No definition available. + Details
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- Definition The aggregate revenue from residents fees and related services provided during the reporting period. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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