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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, 2016
Dec. 31, 2015
Carrying Value $ 88,512 $ 77,842
Other Investments [Member]    
Carrying Value 88,512 77,842
Remaining Commitment 134,089 74,353
Maximum Exposure to Loss [1] 222,601 152,195
Alternative Investments [Member]    
Carrying Value 78,482 67,834
Remaining Commitment 111,478 71,153
Maximum Exposure to Loss [1] 189,960 138,987
Private Equity [Member] | Alternative Investments [Member]    
Carrying Value 35,444 35,088
Remaining Commitment 57,793 30,204
Maximum Exposure to Loss [1] 93,237 65,292
Private Credit [Member] | Alternative Investments [Member]    
Carrying Value 27,709 13,246
Remaining Commitment 30,763 15,129
Maximum Exposure to Loss [1] 58,472 28,375
Real Assets [Member] | Alternative Investments [Member]    
Carrying Value 15,329 19,500
Remaining Commitment 22,922 25,820
Maximum Exposure to Loss [1] 38,251 45,320
Other Securities [Member]    
Carrying Value 10,030 10,008
Remaining Commitment 22,611 3,200
Maximum Exposure to Loss [1] $ 32,641 $ 13,208
[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.