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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Mar. 31, 2019
Valuation Allowance [Line Items]            
Gross deferred federal, state and local tax expense (benefit) $ 26,700   $ 64,200      
Gain (loss) on sale of assets, net (1,029) $ 2,846 371,810 $ 2,144    
Deferred federal, state and local tax expense (benefit) (28,900)          
Change in valuation allowance 33,200   79,500      
Deferred tax asset related to employee compensation   1,700   1,700   $ 1,700
Valuation allowance 329,500   329,500   $ 408,900  
Federal and State            
Valuation Allowance [Line Items]            
Deferred federal, state and local tax expense (benefit)   (13,000)   (19,500)    
Tax expense (benefit)   $ 13,000   $ 21,200    
ASC 842            
Valuation Allowance [Line Items]            
Change in valuation allowance     13,800      
Current operating loss            
Valuation Allowance [Line Items]            
Change in valuation allowance     21,700      
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