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Net Investment and Interest Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Net Investment Income [Line Items] |  |  |
Investment income | $ 101,216 | $ 83,255 | $ 75,858
Less: investment expenses | (3,820) | (2,724) | (1,962)
Investment income, related party | 4,880 | 6,086 | 10,832
Net investment and interest income | 102,276 | 86,617 | 84,728
Fixed Maturities [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 73,041 | 63,453 | 58,716
Real Estate [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 5,189 | 3,775 | 2,669
Insurance policy loans [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 1,212 | 1,188 | 1,072
Mortgage loans [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 20,617 | 14,631 | 10,677
Short-term, amounts held by ceding reinsurers, net and other investments [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | $ 1,157 | $ 208 | $ 2,724

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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