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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of operating segments | segment |  |  | 4 |  |
Number of reportable segments | segment |  |  | 3 |  |
Revenues: |  |  |  |  |
Total revenues | $ 278,969 | $ 266,673 | $ 831,942 | $ 796,185 |
Expenses: |  |  |  |  |
Property operating expenses | 115,987 | 104,689 | 334,141 | 308,650 |
Depreciation and amortization | 71,661 | 66,619 | 214,300 | 209,463 |
General and administrative | 31,032 | 19,883 | 85,228 | 57,880 |
Acquisition and certain other transaction related costs | 51 | 19 | 138 | 148 |
Impairment of assets | 4,525 | 0 | 5,073 | 5,082 |
Total expenses | 223,256 | 191,210 | 638,880 | 581,223 |
Gain on sale of properties | 0 | 0 | 261,916 | 0 |
Dividend income | 660 | 659 | 1,978 | 1,978 |
Unrealized gains and losses on equity securities, net | 35,137 | 0 | 85,643 | 0 |
Interest and other income | 248 | 128 | 362 | 323 |
Interest expense | (45,416) | (40,105) | (133,781) | (124,394) |
Gain (loss) on early extinguishment of debt | 108 | (274) | (22) | (7,627) |
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee | 46,450 | 35,871 | 409,158 | 85,242 |
Income tax expense | (79) | (109) | (444) | (300) |
Equity in earnings of an investee | 831 | 31 | 882 | 533 |
Net income (loss) | 47,202 | 35,793 | 409,596 | 85,475 |
Net income attributable to noncontrolling interest | (1,397) | (1,379) | (4,181) | (2,865) |
Net income (loss) attributable to common shareholders | 45,805 | 34,414 | 405,415 | 82,610 |
Assets | 7,453,444 |  | 7,453,444 |  | $ 7,294,019
MOBs |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 104,492 | 96,116 | 309,497 | 285,413 |
Expenses: |  |  |  |  |
Property operating expenses | 32,652 | 29,158 | 94,773 | 83,980 |
Depreciation and amortization | 35,223 | 32,351 | 105,934 | 95,890 |
General and administrative | 0 | 0 | 0 | 0 |
Acquisition and certain other transaction related costs | 0 | 0 | 0 | 0 |
Impairment of assets | 0 |  | 0 | 0 |
Total expenses | 67,875 | 61,509 | 200,707 | 179,870 |
Gain on sale of properties |  |  | 0 |  |
Dividend income | 0 | 0 | 0 | 0 |
Unrealized gains and losses on equity securities, net | 0 |  | 0 |  |
Interest and other income | 0 | 0 | 0 | 0 |
Interest expense | (6,172) | (6,172) | (18,194) | (18,742) |
Gain (loss) on early extinguishment of debt | 0 | 0 | 0 | (59) |
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee | 30,445 | 28,435 | 90,596 | 86,742 |
Income tax expense | 0 | 0 | 0 | 0 |
Equity in earnings of an investee | 0 | 0 | 0 | 0 |
Net income (loss) | 30,445 | 28,435 | 90,596 | 86,742 |
Net income attributable to noncontrolling interest | (1,397) | (1,379) | (4,181) | (2,865) |
Net income (loss) attributable to common shareholders | 29,048 | 27,056 | 86,415 | 83,877 |
Assets | 3,408,381 |  | 3,408,381 |  | 3,367,485
Triple Net Leased Senior Living Communities |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 64,538 | 67,662 | 198,626 | 202,340 |
Expenses: |  |  |  |  |
Property operating expenses | 0 | 0 | 0 | 0 |
Depreciation and amortization | 20,148 | 20,629 | 60,529 | 61,434 |
General and administrative | 0 | 0 | 0 | 0 |
Acquisition and certain other transaction related costs | 0 | 0 | 0 | 0 |
Impairment of assets | 4,525 |  | 5,073 | 0 |
Total expenses | 24,673 | 20,629 | 65,602 | 61,434 |
Gain on sale of properties |  |  | 261,916 |  |
Dividend income | 0 | 0 | 0 | 0 |
Unrealized gains and losses on equity securities, net | 0 |  | 0 |  |
Interest and other income | 0 | 0 | 0 | 0 |
Interest expense | (327) | (655) | (1,463) | (8,205) |
Gain (loss) on early extinguishment of debt | 76 | 0 | 76 | (7,294) |
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee | 39,614 | 46,378 | 393,553 | 125,407 |
Income tax expense | 0 | 0 | 0 | 0 |
Equity in earnings of an investee | 0 | 0 | 0 | 0 |
Net income (loss) | 39,614 | 46,378 | 393,553 | 125,407 |
Net income attributable to noncontrolling interest | 0 | 0 | 0 | 0 |
Net income (loss) attributable to common shareholders | 39,614 | 46,378 | 393,553 | 125,407 |
Assets | 2,121,134 |  | 2,121,134 |  | 2,251,756
Managed Senior Living Communities |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 105,321 | 98,325 | 309,981 | 294,748 |
Expenses: |  |  |  |  |
Property operating expenses | 83,335 | 75,531 | 239,368 | 224,670 |
Depreciation and amortization | 15,341 | 12,691 | 44,993 | 49,295 |
General and administrative | 0 | 0 | 0 | 0 |
Acquisition and certain other transaction related costs | 0 | 0 | 0 | 0 |
Impairment of assets | 0 |  | 0 | 0 |
Total expenses | 98,676 | 88,222 | 284,361 | 273,965 |
Gain on sale of properties |  |  | 0 |  |
Dividend income | 0 | 0 | 0 | 0 |
Unrealized gains and losses on equity securities, net | 0 |  | 0 |  |
Interest and other income | 0 | 0 | 0 | 0 |
Interest expense | (997) | (1,172) | (3,580) | (3,523) |
Gain (loss) on early extinguishment of debt | 32 | 0 | (98) | 0 |
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee | 5,680 | 8,931 | 21,942 | 17,260 |
Income tax expense | 0 | 0 | 0 | 0 |
Equity in earnings of an investee | 0 | 0 | 0 | 0 |
Net income (loss) | 5,680 | 8,931 | 21,942 | 17,260 |
Net income attributable to noncontrolling interest | 0 | 0 | 0 | 0 |
Net income (loss) attributable to common shareholders | 5,680 | 8,931 | 21,942 | 17,260 |
Assets | 1,351,382 |  | 1,351,382 |  | 1,273,757
All Other Operations |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 4,618 | 4,570 | 13,838 | 13,684 |
Expenses: |  |  |  |  |
Property operating expenses | 0 | 0 | 0 | 0 |
Depreciation and amortization | 949 | 948 | 2,844 | 2,844 |
General and administrative | 31,032 | 19,883 | 85,228 | 57,880 |
Acquisition and certain other transaction related costs | 51 | 19 | 138 | 148 |
Impairment of assets | 0 |  | 0 | 5,082 |
Total expenses | 32,032 | 20,850 | 88,210 | 65,954 |
Gain on sale of properties |  |  | 0 |  |
Dividend income | 660 | 659 | 1,978 | 1,978 |
Unrealized gains and losses on equity securities, net | 35,137 |  | 85,643 |  |
Interest and other income | 248 | 128 | 362 | 323 |
Interest expense | (37,920) | (32,106) | (110,544) | (93,924) |
Gain (loss) on early extinguishment of debt | 0 | (274) | 0 | (274) |
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee | (29,289) | (47,873) | (96,933) | (144,167) |
Income tax expense | (79) | (109) | (444) | (300) |
Equity in earnings of an investee | 831 | 31 | 882 | 533 |
Net income (loss) | (28,537) | (47,951) | (96,495) | (143,934) |
Net income attributable to noncontrolling interest | 0 | 0 | 0 | 0 |
Net income (loss) attributable to common shareholders | (28,537) | (47,951) | (96,495) | (143,934) |
Assets | 572,547 |  | 572,547 |  | $ 401,021
Rental income |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 173,648 | 168,348 | 521,961 | 501,437 |
Rental income | MOBs |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 104,492 | 96,116 | 309,497 | 285,413 |
Rental income | Triple Net Leased Senior Living Communities |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 64,538 | 67,662 | 198,626 | 202,340 |
Rental income | Managed Senior Living Communities |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Rental income | All Other Operations |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 4,618 | 4,570 | 13,838 | 13,684 |
Residents fees and services |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 105,321 | 98,325 | 309,981 | 294,748 |
Residents fees and services | MOBs |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Residents fees and services | Triple Net Leased Senior Living Communities |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 0 | 0 | 0 | 0 |
Residents fees and services | Managed Senior Living Communities |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | 105,321 | 98,325 | 309,981 | 294,748 |
Residents fees and services | All Other Operations |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues | $ 0 | $ 0 | $ 0 | $ 0 |

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