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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
VOBA asset, amortization period 2 years      
Decrease in cash inflows from cash flows provided by operating activities $ (2,137,195) $ (1,221,701) $ (1,025,787)  
Increase in cash flows used in investing activities $ (2,988,644) $ (2,536,613) (122,434)  
Accounting Standards Update 2016-15        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Decrease in cash inflows from cash flows provided by operating activities     20,000  
Increase in cash flows used in investing activities     $ 20,000  
Retained earnings | Accounting Standards Update 2016-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect of adoption of new accounting principle in period of adoption       $ 2,213