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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