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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, 2018
Dec. 31, 2017
Carrying Value $ 145,203 $ 132,268
Other Investments [Member]    
Carrying Value 145,203 132,268
Remaining Commitment 237,178 220,999
Maximum Exposure to Loss [1] 382,381 353,267
Alternative Investments [Member]    
Carrying Value 124,027 115,373
Remaining Commitment 237,178 220,999
Maximum Exposure to Loss [1] 361,205 336,372
Private Equity [Member] | Alternative Investments [Member]    
Carrying Value 59,681 52,251
Remaining Commitment 110,833 99,026
Maximum Exposure to Loss [1] 170,514 151,277
Private Credit [Member] | Alternative Investments [Member]    
Carrying Value 40,916 37,743
Remaining Commitment 89,757 94,959
Maximum Exposure to Loss [1] 130,673 132,702
Real Assets [Member] | Alternative Investments [Member]    
Carrying Value 23,430 25,379
Remaining Commitment 36,588 27,014
Maximum Exposure to Loss [1] 60,018 52,393
Other Securities [Member]    
Carrying Value 21,176 16,895
Remaining Commitment 0 0
Maximum Exposure to Loss [1] $ 21,176 $ 16,895
[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.