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Reinsurance - Reinsurance Recoverables and Financial Strength Ratings by Reinsurer (Details) - USD ($)
$ in Thousands

Jun. 30, 2018

Dec. 31, 2017

Ceded Credit Risk [Line Items]

Reinsurance recoverables

$ 4,199,275

$ 4,205,173

Pecan Re Inc [Member] | External credit rating, not rated [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

^[1],[2]

2,740,406

2,725,795

SCOR Global Life Reinsurance Companies [Member] | AM Best, A+ Rating [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

^[3]

358,777

354,458

Munich Re of Malta [Member] | External credit rating, not rated [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

^[1],[4]

287,853

302,391

Swiss Re Life & Health America Inc. [Member] | AM Best, A+ Rating [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

^[5]

237,868

245,543

American Health and Life Insurance Company [Member] | AM Best, B Rating [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

^[1]

171,072

172,956

Munich American Reassurance Company [Member] | AM Best, A+ Rating [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

113,630

112,841

Korean Reinsurance Company [Member] | AM Best, A Rating [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

102,602

102,915

RGA Reinsurance Company [Member] | AM Best, A+ Rating [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

89,156

90,037

Hannover Life Reassurance Company [Member] | AM Best, A+ Rating [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

31,126

32,250

TOA Reinsurance Company [Member] | AM Best, A Rating [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

24,446

24,619

All Other Reinsurers [Member]

Ceded Credit Risk [Line Items]

Reinsurance recoverables

$ 42,339

$ 41,368

[1]	Includes balances ceded under coinsurance transactions of term life insurance policies that were in force as of December 31, 2009. Amounts shown are net of their share of the reinsurance recoverables from other reinsurers.
[2]	Pecan Re Inc. is a wholly owned subsidiary of Swiss Re Life & Health America Inc.
[3]	Includes amounts ceded to Transamerica Reinsurance Companies and fully retroceded to SCOR Global Life Reinsurance Companies.
[4]	This entity is rated AA- by S&P.
[5]	Includes amounts ceded to Lincoln National Life Insurance and fully retroceded to Swiss Re Life & Health America Inc.

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+ References

No definition available.

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- Definition

Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),6)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489

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