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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
Mar. 31, 2017
Dec. 31, 2016
Carrying Value $ 106,796 $ 102,397
Other Investments [Member]    
Carrying Value 106,796 102,397
Remaining Commitment 143,445 143,686
Maximum Exposure to Loss [1] 250,241 246,083
Alternative Investments [Member]    
Carrying Value 88,645 83,814
Remaining Commitment 143,178 140,286
Maximum Exposure to Loss [1] 231,823 224,100
Private Equity [Member] | Alternative Investments [Member]    
Carrying Value 41,354 41,135
Remaining Commitment 74,669 76,774
Maximum Exposure to Loss [1] 116,023 117,909
Private Credit [Member] | Alternative Investments [Member]    
Carrying Value 31,026 28,193
Remaining Commitment 40,745 40,613
Maximum Exposure to Loss [1] 71,771 68,806
Real Assets [Member] | Alternative Investments [Member]    
Carrying Value 16,265 14,486
Remaining Commitment 27,764 22,899
Maximum Exposure to Loss [1] 44,029 37,385
Other Securities [Member]    
Carrying Value 18,151 18,583
Remaining Commitment 267 3,400
Maximum Exposure to Loss [1] $ 18,418 $ 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.