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Reinsurance and Policy Benefits and Losses, Claims and Loss Expenses Payable (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Property and Casualty Insurance | Premiums earned: Property and casualty |  |  |  |  |  |
Year ended December 31, |  |  |  |  |  |
Direct amount (a) | $ 31,537 | [1] | $ 30,145 | [1] | $ 28,179 | [1]
Ceded to other companies | 0 |  | 0 |  | (68) |
Assumed from other companies | 2,805 |  | 2,486 |  | 2,593 |
Net amount (a) | 34,342 | [1] | 32,631 | [1] | 30,704 | [1]
Percentage of amount assumed to net | 8.00% |  | 8.00% |  | 8.00% |
Life Insurance | Life insurance in force |  |  |  |  |  |
Year ended December 31, |  |  |  |  |  |
Direct amount (a) | 811,035 | [1] | 761,070 | [1] | 668,740 | [1]
Ceded to other companies | (16,471) |  | (14,868) |  | (3,567) |
Assumed from other companies | 1,083,550 |  | 1,142,247 |  | 884,932 |
Net amount (a) | 1,878,114 | [1] | 1,888,449 | [1] | 1,550,105 | [1]
Percentage of amount assumed to net | 58.00% |  | 60.00% |  | 57.00% |
Life Insurance | Premiums earned: Life |  |  |  |  |  |
Year ended December 31, |  |  |  |  |  |
Direct amount (a) | 52,751 | [1] | 63,396 | [1] | 77,721 | [1]
Ceded to other companies | (2,685) |  | (6,909) |  | 0 |
Assumed from other companies | 13,640 |  | 94,982 |  | 37,300 |
Net amount (a) | 63,706 | [1] | 151,469 | [1] | 115,021 | [1]
Percentage of amount assumed to net | 21.00% |  | 63.00% |  | 32.00% |
Life Insurance | Premiums earned: Accident and health |  |  |  |  |  |
Year ended December 31, |  |  |  |  |  |
Direct amount (a) | 106,266 | [1] | 115,599 | [1] | 88,441 | [1]
Ceded to other companies | (454) |  | (503) |  | (575) |
Assumed from other companies | 3,409 |  | 3,635 |  | 3,815 |
Net amount (a) | 109,221 | [1] | 118,731 | [1] | 91,681 | [1]
Percentage of amount assumed to net | 3.00% |  | 3.00% |  | 4.00% |
Life Insurance | Premiums earned: Annuity |  |  |  |  |  |
Year ended December 31, |  |  |  |  |  |
Direct amount (a) | 6,095 | [1] | 9,049 | [1] | 0 | [1]
Ceded to other companies | (1,208) |  | (1,920) |  | 0 |
Assumed from other companies | 301 |  | 233 |  | 290 |
Net amount (a) | $ 5,188 | [1] | $ 7,362 | [1] | $ 290 | [1]
Percentage of amount assumed to net | 6.00% |  | 3.00% |  | 100.00% |
[1] | Balances are reported net of inter-segment transactions

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- Definition Amount of premiums assumed from other companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Amount of premiums ceded to other companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Gross amount of premium revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Net amount of gross premiums, less premiums ceded to other companies, plus premiums assumed from other companies; which represents the net amount of premium revenue on the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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- Definition Percentage of amount of premiums assumed from other companies to net amount of premiums. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 + Details
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