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RELATED PARTY TRANSACTIONS (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
RELATED PARTY TRANSACTIONS      
Mortgage loan payments received $ 1,016,899,000 $ 1,068,552,000 $ 923,347,000
Payments to acquire a building at the end of the lease term 75,000,000.0    
Affiliates      
RELATED PARTY TRANSACTIONS      
Lease revenues 6,400,000 6,000,000.0 6,200,000
Cost of services 277,700,000 249,300,000 240,900,000
Intercompany payables 50,900,000 36,400,000  
Intercompany receivables 8,000,000.0 11,300,000  
Certain corporations with which the parent's directors were affiliated      
RELATED PARTY TRANSACTIONS      
Premiums and policy fees or other amounts for insurance and investment products, interest on bonds and commissions on securities underwriting 6,400,000 6,800,000 6,800,000
Joint Venture      
RELATED PARTY TRANSACTIONS      
Mortgage loan payments received 23,200,000 6,800,000 41,200,000
Proceeds from collection of principal payments on mortgage loans 15,600,000    
Payment of Management Fee | Affiliates      
RELATED PARTY TRANSACTIONS      
Management fee for certain services provided 11,100,000 12,200,000 10,900,000
PLC      
RELATED PARTY TRANSACTIONS      
Guarantee of synthetic lease financing 75,000,000    
PLC | Certain corporations with which the parent's directors were affiliated      
RELATED PARTY TRANSACTIONS      
Commission, interest on debt and investment products and fees 1,900,000 $ 2,300,000 $ 2,400,000
PLC | Shades Creek | Agreement to Provide Additional Capital | Affiliates      
RELATED PARTY TRANSACTIONS      
Management fee for certain services provided $ 0