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Investments (Carrying value of other investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Investments [Abstract]    
Mortgage loans, net $ 309,952 $ 262,875
Short-term investments 10,350 15,149
Real estate 53,776 66,174
Policy loans 17,677 17,112
Other equity investments 7,309 6,520
Total investments $ 399,064 $ 367,830