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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, 2016
Dec. 31, 2015
Carrying Value $ 80,916 $ 77,842
Alternative Investments [Member]    
Carrying Value 71,209 67,834
Remaining Commitment 82,438 71,153
Maximum Exposure to Loss 153,647 138,987
Other Investments [Member]    
Carrying Value 80,916 77,842
Remaining Commitment 89,288 74,353
Maximum Exposure to Loss 170,204 152,195
Private Equity [Member] | Alternative Investments [Member]    
Carrying Value 32,478 35,088
Remaining Commitment 28,750 30,204
Maximum Exposure to Loss 61,228 65,292
Private Credit [Member] | Alternative Investments [Member]    
Carrying Value 21,939 13,246
Remaining Commitment 25,129 15,129
Maximum Exposure to Loss 47,068 28,375
Real Assets [Member] | Alternative Investments [Member]    
Carrying Value 16,792 19,500
Remaining Commitment 28,559 25,820
Maximum Exposure to Loss 45,351 45,320
Other Securities [Member]    
Carrying Value 9,707 10,008
Remaining Commitment 6,850 3,200
Maximum Exposure to Loss $ 16,557 $ 13,208