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Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Carrying Value $ 120,806 $ 102,397
Other Investments [Member]    
Carrying Value 120,806 102,397
Remaining Commitment 166,579 143,686
Maximum Exposure to Loss [1] 287,385 246,083
Alternative Investments [Member]    
Carrying Value 102,621 83,814
Remaining Commitment 166,579 140,286
Maximum Exposure to Loss [1] 269,200 224,100
Private Equity [Member] | Alternative Investments [Member]    
Carrying Value 47,654 41,135
Remaining Commitment 81,478 76,774
Maximum Exposure to Loss [1] 129,132 117,909
Private Credit [Member] | Alternative Investments [Member]    
Carrying Value 33,318 28,193
Remaining Commitment 53,635 40,613
Maximum Exposure to Loss [1] 86,953 68,806
Real Assets [Member] | Alternative Investments [Member]    
Carrying Value 21,649 14,486
Remaining Commitment 31,466 22,899
Maximum Exposure to Loss [1] 53,115 37,385
Other Securities [Member]    
Carrying Value 18,185 18,583
Remaining Commitment 0 3,400
Maximum Exposure to Loss [1] $ 18,185 $ 21,983
[1] The maximum exposure to loss includes both the carry value of these investments and the related unfunded commitments. In addition, tax credits that have been previously recognized in Other securities are subject to the risk of recapture, which we do not consider significant.