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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 4 |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Total revenues | $ 285,222 | $ 278,969 | $ 277,202 | $ 275,770 | $ 278,543 | $ 266,673 | $ 264,992 | $ 264,521 | $ 1,117,164 | $ 1,074,729 | $ 1,058,022
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 451,581 | 413,492 | 399,790
Depreciation and amortization |  |  |  |  |  |  |  |  | 286,235 | 276,861 | 287,831
General and administrative |  |  |  |  |  |  |  |  | 85,885 | 103,694 | 46,559
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 194 | 403 | 2,085
Impairment of assets |  |  |  |  |  |  |  |  | 66,346 | 5,082 | 18,674
Total expenses |  |  |  |  |  |  |  |  | 890,241 | 799,532 | 754,939
Gain on sale of properties |  |  |  |  |  |  |  |  | 261,916 | 46,055 | 4,061
Dividend income |  |  |  |  |  |  |  |  | 2,901 | 2,637 | 2,108
Unrealized losses on equity securities |  |  |  |  |  |  |  |  | (20,724) | 0 | 0
Interest and other income |  |  |  |  |  |  |  |  | 667 | 406 | 430
Interest expense |  |  |  |  |  |  |  |  | (179,287) | (165,019) | (167,574)
Gain (loss) on early extinguishment of debt |  |  |  |  |  |  |  |  | (22) | (7,627) | (526)
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | 292,374 | 151,649 | 141,582
Income tax expense |  |  |  |  |  |  |  |  | (476) | (454) | (424)
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 516 | 608 | 137
Net income (loss) |  |  |  |  |  |  |  |  | 292,414 | 151,803 | 141,295
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (5,542) | (4,193) | 0
Net income attributable to common shareholders | (118,543) | $ 45,805 | $ 123,587 | $ 236,022 | 65,000 | $ 34,414 | $ 16,042 | $ 32,155 | 286,872 | 147,610 | 141,295
Total assets | 7,160,426 |  |  |  | 7,294,019 |  |  |  | 7,160,426 | 7,294,019 | 7,227,754
MOBs |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 412,813 | 382,127 | 372,233
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 127,732 | 112,930 | 105,762
Depreciation and amortization |  |  |  |  |  |  |  |  | 141,477 | 128,827 | 124,196
General and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  | 46,797 | 0 | 7,122
Total expenses |  |  |  |  |  |  |  |  | 316,006 | 241,757 | 237,080
Gain on sale of properties |  |  |  |  |  |  |  |  | 0 | 0 | 0
Dividend income |  |  |  |  |  |  |  |  |  | 0 | 0
Unrealized losses on equity securities |  |  |  |  |  |  |  |  | 0 |  |
Interest and other income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | (24,360) | (24,919) | (13,852)
Gain (loss) on early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | (59) | 0
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | 72,447 | 115,392 | 121,301
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) |  |  |  |  |  |  |  |  | 72,447 | 115,392 | 121,301
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (5,542) | (4,193) |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | 66,905 | 111,199 |
Total assets | 3,344,581 |  |  |  | 3,367,485 |  |  |  | 3,344,581 | 3,367,485 | 3,333,141
Triple Net Leased Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 269,512 | 280,641 | 275,697
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 833
Depreciation and amortization |  |  |  |  |  |  |  |  | 80,277 | 81,976 | 78,361
General and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  | 19,549 | 0 | 6,583
Total expenses |  |  |  |  |  |  |  |  | 99,826 | 81,976 | 85,777
Gain on sale of properties |  |  |  |  |  |  |  |  | 261,916 | 45,901 | 4,061
Dividend income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Unrealized losses on equity securities |  |  |  |  |  |  |  |  | 0 |  |
Interest and other income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | (1,641) | (8,855) | (24,795)
Gain (loss) on early extinguishment of debt |  |  |  |  |  |  |  |  | 76 | (7,294) | (467)
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | 430,037 | 228,417 | 168,719
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) |  |  |  |  |  |  |  |  | 430,037 | 228,417 | 168,719
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | 430,037 | 228,417 |
Total assets | 2,044,939 |  |  |  | 2,251,756 |  |  |  | 2,044,939 | 2,251,756 | 2,289,045
Managed Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 416,523 | 393,707 | 391,822
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 323,849 | 300,562 | 293,195
Depreciation and amortization |  |  |  |  |  |  |  |  | 60,689 | 62,266 | 81,482
General and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  | 0 | 0 | 2,174
Total expenses |  |  |  |  |  |  |  |  | 384,538 | 362,828 | 376,851
Gain on sale of properties |  |  |  |  |  |  |  |  | 0 | 0 | 0
Dividend income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Unrealized losses on equity securities |  |  |  |  |  |  |  |  | 0 |  |
Interest and other income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | (4,477) | (4,685) | (8,540)
Gain (loss) on early extinguishment of debt |  |  |  |  |  |  |  |  | (98) | 0 | (59)
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | 27,410 | 26,194 | 6,372
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) |  |  |  |  |  |  |  |  | 27,410 | 26,194 | 6,372
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | 27,410 | 26,194 |
Total assets | 1,395,657 |  |  |  | 1,273,757 |  |  |  | 1,395,657 | 1,273,757 | 1,260,032
All Other Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 18,316 | 18,254 | 18,270
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,792 | 3,792 | 3,792
General and administrative |  |  |  |  |  |  |  |  | 85,885 | 103,694 | 46,559
Acquisition and certain other transaction related costs |  |  |  |  |  |  |  |  | 194 | 403 | 2,085
Impairment of assets |  |  |  |  |  |  |  |  | 0 | 5,082 | 2,795
Total expenses |  |  |  |  |  |  |  |  | 89,871 | 112,971 | 55,231
Gain on sale of properties |  |  |  |  |  |  |  |  | 0 | 154 | 0
Dividend income |  |  |  |  |  |  |  |  | 2,901 | 2,637 | 2,108
Unrealized losses on equity securities |  |  |  |  |  |  |  |  | (20,724) |  |
Interest and other income |  |  |  |  |  |  |  |  | 667 | 406 | 430
Interest expense |  |  |  |  |  |  |  |  | (148,809) | (126,560) | (120,387)
Gain (loss) on early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | (274) | 0
Income (loss) from continuing operations before income tax expense and equity in earnings of an investee |  |  |  |  |  |  |  |  | (237,520) | (218,354) | (154,810)
Income tax expense |  |  |  |  |  |  |  |  | (476) | (454) | (424)
Equity in earnings of an investee |  |  |  |  |  |  |  |  | 516 | 608 | 137
Net income (loss) |  |  |  |  |  |  |  |  | (237,480) | (218,200) | (155,097)
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 | 0 |
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | (237,480) | (218,200) |
Total assets | $ 375,249 |  |  |  | $ 401,021 |  |  |  | 375,249 | 401,021 | 345,536
Rental income |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 700,641 | 681,022 | 666,200
Rental income | MOBs |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 412,813 | 382,127 | 372,233
Rental income | Triple Net Leased Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 269,512 | 280,641 | 275,697
Rental income | Managed Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Rental income | All Other Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 18,316 | 18,254 | 18,270
Residents fees and services |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 416,523 | 393,707 | 391,822
Residents fees and services | MOBs |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Residents fees and services | Triple Net Leased Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Residents fees and services | Managed Senior Living Communities |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 416,523 | 393,707 | 391,822
Residents fees and services | All Other Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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