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Recent Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2016
Jun. 30, 2017
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Change in restricted cash reclassified out of investing activities $ 90,000      
Insurance premium revenues and investment portfolio revenues as a percentage of consolidated revenues   77.00%    
Approximate percentage the Company anticipates will have no impact as a result of the adoption of the revenue recognition ASU   80.00%    
Approximate percentage impact the Company is still evaluating regarding the adoption of the revenue recognition ASU   20.00%    
Net unrealized gains, net of taxes, included in accumulated other comprehensive income $ 1,722,277 $ 1,565,866 $ 1,911,933 $ 1,354,508
Future minimum lease payments   $ 234,300    
Equity Securities [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net unrealized gains, net of taxes, included in accumulated other comprehensive income     $ 1,800,000