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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Marketable securities | $ 19,991 |  |  | $ 19,991 |  | $ 291,796
Gains related to trading securities | 300 |  |  | 1,500 |  |
Debt | 4,816,304 |  |  | 4,816,304 |  | 5,142,291
Goodwill impairment |  |  |  | 351,652 |  |
Property, plant and equipment and leasehold intangibles, net | 6,900 |  | $ 1,400 | 47,700 | $ 2,400 |
Investment in unconsolidated ventures |  |  |  | 33,400 | $ 19,700 |
Reported Value Measurement |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt | 3,700,000 |  |  | 3,700,000 |  | $ 3,900,000
Assisted Living |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Amount of carrying amount in excess of fair value |  | $ 351,700 |  |  |  |
Goodwill impairment |  | $ 351,700 |  | 351,652 |  |
Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Marketable securities | $ 20,000 |  |  | $ 20,000 |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=114001220&loc=d3e32787-111569 + Details
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