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Supplemental Schedule of Reinsurance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums, Life Insurance in Force | $ 1,363,000 | $ 1,462,000 | $ 1,576,000
Ceded Premiums, Life Insurance in Force | 186,172,000 | 205,529,000 | 214,727,000
Assumed Premiums, Life Insurance in Force | 3,329,181,000 | 3,297,275,000 | 3,062,525,000
Premiums, Net, Life Insurance in Force | $ 3,144,372,000 | $ 3,093,208,000 | $ 2,849,374,000
Life Insurance in Force Premiums, Percentage Assumed to Net | 105.90% | 106.60% | 107.50%
Direct Premiums Earned | $ 62,526 | $ 61,571 | $ 57,562
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 860,034 | 862,903 | 858,278
Assumed Premiums Earned | 11,341,284 | 10,642,462 | 10,049,587
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 10,543,776 | $ 9,841,130 | $ 9,248,871
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 107.60% | 108.10% | 108.70%
US Traditional Segment Reporting Information [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Earned | $ 31,600 | $ 30,500 | $ 31,600
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 593,700 | 610,400 | 616,000
Assumed Premiums Earned | 6,095,400 | 5,936,200 | 5,834,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 5,533,300 | $ 5,356,300 | $ 5,249,600
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 110.20% | 110.80% | 111.10%
US Non-Traditional Segment Reporting Information [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Earned | $ 4,700 | $ 4,300 | $ 1,600
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 0 | 0 | 40,200
Assumed Premiums Earned | 22,500 | 19,400 | 63,000
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 27,200 | $ 23,700 | $ 24,400
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 82.70% | 81.90% | 258.20%
Canada Traditional Segment Reporting Information [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Earned | $ 0 | $ 0 | $ 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 46,900 | 38,100 | 36,500
Assumed Premiums Earned | 1,070,900 | 940,100 | 965,100
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 1,024,000 | $ 902,000 | $ 928,600
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 104.60% | 104.20% | 103.90%
Canada Non-Traditional Segment Reporting Information [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Earned | $ 0 | $ 0 | $ 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 0 | 0 | 0
Assumed Premiums Earned | 43,400 | 38,200 | 38,700
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 43,400 | $ 38,200 | $ 38,700
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 100.00% | 100.00% | 100.00%
EMEA Traditional Segment Reporting Information [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Earned | $ 26,000 | $ 26,600 | $ 24,100
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 25,900 | 34,900 | 30,900
Assumed Premiums Earned | 1,423,100 | 1,310,000 | 1,146,900
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 1,423,200 | $ 1,301,700 | $ 1,140,100
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 100.00% | 100.60% | 100.60%
EMEA Non-Traditional Segment Reporting Information [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Earned | $ 200 | $ 200 | $ 300
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 143,700 | 125,000 | 84,400
Assumed Premiums Earned | 338,800 | 288,500 | 264,400
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 195,300 | $ 163,700 | $ 180,300
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 173.50% | 176.20% | 146.60%
Asia Pacific Traditional Segment Reporting Information [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Earned | $ 0 | $ 0 | $ 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 49,800 | 54,500 | 50,300
Assumed Premiums Earned | 2,346,200 | 2,107,500 | 1,731,800
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 2,296,400 | $ 2,053,000 | $ 1,681,500
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 102.20% | 102.70% | 103.00%
Asia Pacific Non-Traditional Segment Reporting Information [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Earned | $ 0 | $ 0 | $ 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 0 | 0 | 0
Assumed Premiums Earned | 900 | 2,400 | 5,400
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 900 | $ 2,400 | $ 5,400
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 100.00% | 100.00% | 100.00%
Corporate And Other Segment Reporting Information [Member] |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Direct Premiums Earned | $ 0 | $ 0 | $ 0
Reinsurance Premiums for Insurance Companies, by Product Segment, Amount Ceded to Other Companies | 0 | 0 | 0
Assumed Premiums Earned | 100 | 100 | 300
Reinsurance Premiums for Insurance Companies, by Product Segment, Net Amount | $ 100 | $ 100 | $ 300
Reinsurance Premiums for Insurance Companies, by Product Segment, Percentage of Amount Assumed to Net | 100.00% | 100.00% | 100.00%

X
- Definition Amount of life insurance issued and outstanding assumed from other entity, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column D -Subsection 17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column D)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition Amount of life insurance issued and outstanding ceded to other entity, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column C -Subsection 17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column C)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition Amount, before effect of reinsurance, of life insurance issued and outstanding, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column B)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition Amount, after effect of reinsurance, of life insurance issued and outstanding, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column E -Subsection 17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition Percentage of assumed life insurance contract issued and outstanding to life insurance contract issued and outstanding after effect of reinsurance, as disclosed in supplementary reinsurance information. Includes, but is not limited to, dividend and adjustment to face value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column F -Subsection 17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column F)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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