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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2018
Dec. 31, 2019
Valuation Allowance [Line Items]        
Gross deferred federal, state and local tax expense (benefit) $ 90,900      
Gain (loss) on sale of assets, net 372,839 $ (702)    
Deferred federal, state and local tax expense (benefit) (2,200)      
Change in valuation allowance 112,600      
Deferred tax asset related to employee compensation 1,700 1,700    
Valuation allowance 296,300     $ 408,900
Federal and State        
Valuation Allowance [Line Items]        
Deferred federal, state and local tax expense (benefit)   $ (6,500)    
Change in valuation allowance     $ 6,600  
Operating loss carryforwards 8,200      
ASC 842        
Valuation Allowance [Line Items]        
Change in valuation allowance 13,800      
Current operating loss        
Valuation Allowance [Line Items]        
Change in valuation allowance 8,300      
CCRC Ventures, LLC        
Valuation Allowance [Line Items]        
Gain (loss) on sale of assets, net 93,100      
Healthpeak        
Valuation Allowance [Line Items]        
Change in valuation allowance $ 117,600