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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Revenue Recognition [Abstract] |  |
Term of residency agreements - minimum (in days) | 30 days |
Term of residency agreements - maximum (in years) | 1 year |
Cash and escrow deposits - restricted [Line Items] |  |
Cash and escrow deposits - restricted, current | $ 32,864 | $ 32,570
Cash and escrow deposits - restricted, long term | 28,061 | 33,382
Cash and escrow deposits - restricted, total | 60,925 | 65,952
Accounts Receivable [Abstract] |  |
Allowance for doubtful accounts | 27,000 | 26,500
Increase (Decrease) in Insurance Liabilities [Abstract] |  |
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve | 35,400 |
Increase (Decrease) in Workers' Compensation Liabilities | 12,700 |
Increase (Decrease) in Other Insurance Liabilities | $ 22,700 |
Buildings and Improvements [Member] | Weighted Average [Member] |  |
Estimated useful life of property, plant and equipment [Abstract] |  |
Estimated Useful Life (in years) | 40 years |
Furniture and Equipment [Member] | Minimum [Member] |  |
Estimated useful life of property, plant and equipment [Abstract] |  |
Estimated Useful Life (in years) | 3 years |
Furniture and Equipment [Member] | Maximum [Member] |  |
Estimated useful life of property, plant and equipment [Abstract] |  |
Estimated Useful Life (in years) | 7 years |
Resident lease intangibles [Member] | Minimum [Member] |  |
Estimated useful life of property, plant and equipment [Abstract] |  |
Estimated Useful Life (in years) | 1 year |
Resident lease intangibles [Member] | Maximum [Member] |  |
Estimated useful life of property, plant and equipment [Abstract] |  |
Estimated Useful Life (in years) | 3 years |
Other Intangible Assets [Abstract] | Minimum [Member] |  |
Finite lived intangible assets - useful lives [Abstract] |  |
Estimated Useful Life (in years) | 3 years |
Other Intangible Assets [Abstract] | Maximum [Member] |  |
Finite lived intangible assets - useful lives [Abstract] |  |
Estimated Useful Life (in years) | 9 years |
Tradenames [Member] | Minimum [Member] |  |
Finite lived intangible assets - useful lives [Abstract] |  |
Estimated Useful Life (in years) | 2 years |
Tradenames [Member] | Maximum [Member] |  |
Finite lived intangible assets - useful lives [Abstract] |  |
Estimated Useful Life (in years) | 5 years |
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |
Fair value of financial instruments [Abstract] |  |
Debt at carrying value | $ 3,600,000 | 3,900,000
Real estate taxes [Member] |  |
Cash and escrow deposits - restricted [Line Items] |  |
Cash and escrow deposits - restricted, current | 19,671 | 18,862
Tenant security deposits [Member] |  |
Cash and escrow deposits - restricted [Line Items] |  |
Cash and escrow deposits - restricted, current | 764 | 862
Insurance reserves [Member] |  |
Cash and escrow deposits - restricted [Line Items] |  |
Cash and escrow deposits - restricted, long term | 12,941 | 15,318
Entrance fees [Member] |  |
Cash and escrow deposits - restricted [Line Items] |  |
Cash and escrow deposits - restricted, long term | 13,301 | 13,233
Replacement reserve and other [Member] |  |
Cash and escrow deposits - restricted [Line Items] |  |
Cash and escrow deposits - restricted, current | 6,970 | 8,011
Debt service and other deposits [Member] |  |
Cash and escrow deposits - restricted [Line Items] |  |
Cash and escrow deposits - restricted, long term | 1,819 | 3,429
Other Restricted Cash [Member] |  |
Cash and escrow deposits - restricted [Line Items] |  |
Cash and escrow deposits - restricted, current | 5,459 | 4,835
Cash and escrow deposits - restricted, long term | 0 | 200
Letter of Credit Collateral [Member] |  |
Cash and escrow deposits - restricted [Line Items] |  |
Cash and escrow deposits - restricted, long term | $ 0 | $ 1,202

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