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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
Jun. 30, 2017
Dec. 31, 2016
Carrying Value $ 116,411 $ 102,397
Other Investments [Member]    
Carrying Value 116,411 102,397
Remaining Commitment 164,655 143,686
Maximum Exposure to Loss [1] 281,066 246,083
Alternative Investments [Member]    
Carrying Value 97,670 83,814
Remaining Commitment 164,655 140,286
Maximum Exposure to Loss [1] 262,325 224,100
Private Equity [Member] | Alternative Investments [Member]    
Carrying Value 46,945 41,135
Remaining Commitment 76,027 76,774
Maximum Exposure to Loss [1] 122,972 117,909
Private Credit [Member] | Alternative Investments [Member]    
Carrying Value 29,942 28,193
Remaining Commitment 57,391 40,613
Maximum Exposure to Loss [1] 87,333 68,806
Real Assets [Member] | Alternative Investments [Member]    
Carrying Value 20,783 14,486
Remaining Commitment 31,237 22,899
Maximum Exposure to Loss [1] 52,020 37,385
Other Securities [Member]    
Carrying Value 18,741 18,583
Remaining Commitment 0 3,400
Maximum Exposure to Loss [1] $ 18,741 $ 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.