Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

v3.20.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
3 Months Ended 9 Months Ended
Oct. 16, 2020
USD ($)
Mar. 07, 2018
property
Sep. 30, 2019
USD ($)
Securities
Sep. 30, 2020
USD ($)
property
Sep. 30, 2019
USD ($)
Securities
Dec. 31, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Proceeds from sale of property and equipment       $ (74,000) $ 44,468,000  
Ownership in equity investment (as percent)       22.00%    
Other-than-temporary impairment charge       $ 24,700,000    
Other investments       $ 0   $ 24,020,000
Golf Properties | Disposed of by sale            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Proceeds from sale of property and equipment     $ 12,300,000   $ 55,700,000  
Number of real estate properties sold | Securities     1   8  
Carrying value of property disposed during the period     $ 5,200,000   $ 43,800,000  
Gain (loss) on disposition of property     $ (7,000,000.0)   $ 11,800,000  
Golf Properties | Disposed of by sale | Subsequent event            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Sale price on sale of property $ 34,500,000          
Proceeds from sale of property and equipment $ 33,600,000          
Golf Properties | Held-for-sale            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of properties held for sale | property   26   1    
Real estate assets carrying value       $ 17,000,000.0    
Real estate assets, other related assets       200,000    
Golf Properties | Held-for-sale | Land            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Real estate assets       12,700,000    
Golf Properties | Held-for-sale | Buildings and improvements            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Real estate assets       4,000,000.0    
Golf Properties | Held-for-sale | Furniture, fixtures and equipment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Real estate assets       $ 200,000    
Membership            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deposit refundable period       30 years    
Weighted average life       7 years