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SCHEDULE II - Condensed Financial Information of Registrant - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]          
Assets $ (5,024,405)   $ (3,136,776)   $ (2,756,695)
Liabilities (4,245,824)   $ (2,427,535)    
Right-of-use assets 17,200        
Lease liabilities $ 18,232        
ASU 2016-02          
Condensed Financial Statements, Captions [Line Items]          
Assets   $ 22,600      
Liabilities   30,900      
Cumulative effect of adoption of ASU   8,280      
Right-of-use assets   17,200      
Lease liabilities   17,800      
ASU 2016-01          
Condensed Financial Statements, Captions [Line Items]          
Cumulative effect of adoption of ASU       $ 0  
ASU 2018-02          
Condensed Financial Statements, Captions [Line Items]          
Cumulative effect of adoption of ASU       0  
Retained Earnings | ASU 2016-02          
Condensed Financial Statements, Captions [Line Items]          
Cumulative effect of adoption of ASU   $ 8,280      
Retained Earnings | ASU 2016-01          
Condensed Financial Statements, Captions [Line Items]          
Cumulative effect of adoption of ASU       4,682  
Retained Earnings | ASU 2018-02          
Condensed Financial Statements, Captions [Line Items]          
Cumulative effect of adoption of ASU       $ (711)