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Deferred Policy Acquisition Costs and Deferred Sales Inducements (Deferred Policy Acquisition Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at beginning of year	$ 2,426,652us-gaap_DeferredPolicyAcquisitionCosts	$ 1,709,799us-gaap_DeferredPolicyAcquisitionCosts	$ 1,683,857us-gaap_DeferredPolicyAcquisitionCosts
Costs deferred during the year: commissions	421,802	420,378	399,001
Costs deferred during the year: policy issue costs	5,080	5,422	4,410
Amortization	(163,578)	(365,468)	(164,919)
Effect of net unrealized gains/losses	(631,400)	656,521	(212,550)
Balance at end of year	$ 2,058,556us-gaap_DeferredPolicyAcquisitionCosts	$ 2,426,652us-gaap_DeferredPolicyAcquisitionCosts	$ 1,709,799us-gaap_DeferredPolicyAcquisitionCosts

Amount of expense related to deferred policy acquisition costs.

Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date.