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Acquisitions, Dispositions and Other Significant Transactions - HCP Master Lease Transaction and RIDEA Ventures Restructuring (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2018 community | Jan. 01, 2018 USD ($) community | Nov. 02, 2017 community joint_venture | Apr. 30, 2018 USD ($) community | Mar. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) community | Dec. 31, 2017 USD ($) community | Jun. 30, 2018 USD ($) community | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) community | Jun. 30, 2017 USD ($) | Dec. 31, 2018 community | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash management contract termination fee |  |  |  |  |  |  |  |  |  | $ 5,076 | $ 0 |  |
Gain (loss) on sale of assets, net |  |  |  |  |  |  |  | $ 23,322 | $ (547) | 66,753 | (1,150) |  |
Gain on facility lease termination |  |  |  |  |  |  |  | (146,467) | (6,368) | (146,467) | (6,368) |  |
Revenue |  |  |  |  |  |  |  | 895,969 | 934,070 | 1,802,235 | 1,950,997 |  |
Cash lease payments |  |  |  |  |  |  |  | 87,115 | 90,599 | 176,708 | 185,203 |  |
Master Lease Transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total communities disposed of | community |  |  | 35 |  |  |  |  |  |  |  |  |  |
Annual rent reduction |  | $ 2,500 |  |  |  |  |  |  |  |  |  |  |
Number of communities with rent reduction | community |  | 2 |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |  | $ 9,700 |  | $ 9,700 |  |  |
RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities management is retained | community |  |  | 18 |  |  |  |  |  |  |  |  |  |
HCP, Inc. | Master Lease Transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities acquired | community |  |  |  | 3 |  | 1 |  | 2 |  | 2 |  |  |
Payment to acquire leased assets |  |  |  |  |  |  |  | $ 35,400 |  |  |  |  |
Payments to acquire asset from joint venture |  |  |  | $ 207,400 |  | $ 32,100 |  |  |  |  |  |  |
Number of communities leased | community |  |  | 43 |  |  |  |  |  |  |  |  |  |
RIDEA Ventures | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership |  |  |  |  |  |  | 10.00% | 10.00% |  | 10.00% |  |  | 10.00%
Number of joint ventures |  |  | 2 |  |  |  | 1 |  |  |  |  |  |
Proceeds from sale of joint venture interest |  |  |  |  | $ 62,300 |  | $ 32,100 |  |  |  |  |  |
Number of communities managed | community |  |  | 59 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets, net |  |  |  |  | $ 41,700 |  | $ 7,200 |  |  |  |  |  |
10 Communities Disposed Of Through Lease Terminations | HCP, Inc. | Master Lease Transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of | community |  |  |  |  |  |  |  | 10 |  |  |  |  |
Capital Lease Obligations |  |  |  |  |  |  |  | $ 93,500 |  | $ 93,500 |  |  |
Gain (loss) on sale of assets, net |  |  |  |  |  |  |  | 6,500 |  |  |  |  |
Gain on facility lease termination |  |  |  |  |  |  |  | 1,900 |  |  |  |  |
Assets under leases |  |  |  |  |  |  |  | $ 86,900 |  | 86,900 |  |  |
Number Of Communities Previously Subject To Sale Leaseback Transactions | community |  |  |  |  |  |  |  | 3 |  |  |  |  |
23 Communities Disposed Of Through Lease Terminations |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Lease Obligations |  |  |  |  |  |  |  | $ 287,300 |  | 287,300 |  |  |
Assets under leases |  |  |  |  |  |  |  | 248,200 |  | 248,200 |  |  |
Amount exceeding carrying value of assets under leases |  |  |  |  |  |  |  | 39,100 |  | $ 39,100 |  |  |
Number Of Communities Previously Subject To Sale Leaseback Transactions | community |  |  |  |  |  |  |  |  |  | 17 |  |  |
Cash lease payments |  |  |  |  |  |  |  | $ 7,100 | 7,500 | $ 14,100 | 15,000 |  |
23 Communities Disposed Of Through Lease Terminations | Forecast | HCP, Inc. | Master Lease Transactions |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of | community | 23 |  |  |  |  |  |  |  |  |  |  |  |
37 Communities Disposed Of Through Management Termination | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of | community |  |  | 37 |  |  |  |  | 7 |  | 17 |  |  |
Non-cash management contract termination fee |  |  |  |  |  |  |  | $ 2,800 |  | $ 5,100 |  |  |
37 Communities Disposed Of Through Management Termination | Forecast | RIDEA Ventures Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of | community |  |  |  |  |  |  |  |  |  |  |  | 20 |
33 Communities Disposed Of Through Lease Terminations |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in capital lease obligations and assets under lease |  |  |  |  |  |  |  |  |  |  |  |  | $ 145,600
Retirement Centers |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 159,293 | 162,248 | $ 317,690 | 334,868 |  |
Retirement Centers | 23 Communities Disposed Of Through Lease Terminations |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of | community |  |  |  |  |  |  |  |  |  | 3 |  |  |
Assisted Living |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 522,027 | 547,430 | $ 1,054,307 | 1,137,967 |  |
Assisted Living | 23 Communities Disposed Of Through Lease Terminations |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of | community |  |  |  |  |  |  |  |  |  | 19 |  |  |
CCRCs Rental |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 104,796 | 114,202 | $ 209,865 | 256,000 |  |
CCRCs Rental | 23 Communities Disposed Of Through Lease Terminations |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities disposed of | community |  |  |  |  |  |  |  |  |  | 1 |  |  |
Resident fees |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 895,969 | 934,070 | $ 1,802,235 | 1,950,997 |  |
Resident fees | 23 Communities Disposed Of Through Lease Terminations |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 21,500 | 21,800 | 43,500 | 44,700 |  |
Facility operating |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Costs of services |  |  |  |  |  |  |  | 627,076 | 642,405 | 1,259,401 | 1,316,947 |  |
Facility operating | 23 Communities Disposed Of Through Lease Terminations |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Costs of services |  |  |  |  |  |  |  | 15,300 | 14,500 | 30,700 | 28,900 |  |
Management fees |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 17,071 | 22,442 | 35,752 | 38,336 |  |
Management fees | 33 Communities Disposed Of Through Lease Terminations |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | $ 1,400 | $ 1,400 | $ 2,700 | $ 2,700 |  |

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