Minimum Guarantees (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Fair value of assets supporting separate accounts	$ 27,718,844us-gaap_SeparateAccountAssets	$ 26,630,904us-gaap_SeparateAccountAssets
Equity securities
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Fair value of assets supporting separate accounts	$ 60,368	$ 61,137

The fair value of the assets held by the Entity for the benefit of separate account policyholders.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 80

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6484091&loc=d3e19268-158472

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-Glossary Separate Account

-URI http://asc.fasb.org/extlink&oid=6524887

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 11

-Article 7

Name:	us-gaap_SeparateAccountAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant