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Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Other Assets    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets $ 6,968 $ 10,635
Gross Amounts Offset in the Balance Sheet 1,662 2,941
Net Amounts of Assets Presented in the Balance Sheet 5,306 7,694
Collateral 0 310
Net Amount 5,306 7,384
Other Assets | Interest Rate Futures    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets 1,059 468
Gross Amounts Offset in the Balance Sheet 937 468
Net Amounts of Assets Presented in the Balance Sheet 122 0
Collateral 0 0
Net Amount 122 0
Other Assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets 4,645 5,740
Gross Amounts Offset in the Balance Sheet 82 1,737
Net Amounts of Assets Presented in the Balance Sheet 4,563 4,003
Collateral 0 0
Net Amount 4,563 4,003
Other Assets | Foreign Currency Forward Contracts, Investment Operations    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets 1,007 3,959
Gross Amounts Offset in the Balance Sheet 599 648
Net Amounts of Assets Presented in the Balance Sheet 408 3,311
Collateral 0 0
Net Amount 408 3,311
Other Assets | Credit Default Swaps    
Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets 257 468
Gross Amounts Offset in the Balance Sheet 44 88
Net Amounts of Assets Presented in the Balance Sheet 213 380
Collateral 0 310
Net Amount 213 70
Other Liabilities    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 5,481 3,521
Gross Amounts Offset in the Balance Sheet 1,661 2,172
Net Amounts of Liabilities Presented in the Balance Sheet 3,820 1,349
Collateral 1,803 759
Net Amount 2,017 590
Other Liabilities | Interest Rate Futures    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 2,293 1,037
Gross Amounts Offset in the Balance Sheet 937 468
Net Amounts of Liabilities Presented in the Balance Sheet 1,356 569
Collateral 1,356 569
Net Amount 0 0
Other Liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 1,891 1,319
Gross Amounts Offset in the Balance Sheet 81 967
Net Amounts of Liabilities Presented in the Balance Sheet 1,810 352
Collateral 0 0
Net Amount 1,810 352
Other Liabilities | Foreign Currency Forward Contracts, Investment Operations    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 806 724
Gross Amounts Offset in the Balance Sheet 599 649
Net Amounts of Liabilities Presented in the Balance Sheet 207 75
Collateral 0 0
Net Amount 207 75
Other Liabilities | Credit Default Swaps    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 491 251
Gross Amounts Offset in the Balance Sheet 44 88
Net Amounts of Liabilities Presented in the Balance Sheet 447 163
Collateral 447 0
Net Amount $ 0 163
Other Liabilities | Weather Contract    
Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities   190
Gross Amounts Offset in the Balance Sheet   0
Net Amounts of Liabilities Presented in the Balance Sheet   190
Collateral   190
Net Amount   $ 0