Consolidated Statements of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Premiums and other revenue:
Universal life and annuity contract charges	$ 150,596us-gaap_InsuranceCommissionsAndFees	$ 148,388us-gaap_InsuranceCommissionsAndFees	$ 149,328us-gaap_InsuranceCommissionsAndFees
Traditional life premiums	19,519us-gaap_PremiumsEarnedNetLife	19,078us-gaap_PremiumsEarnedNetLife	18,616us-gaap_PremiumsEarnedNetLife
Net investment income	505,430us-gaap_NetInvestmentIncome	660,432us-gaap_NetInvestmentIncome	460,048us-gaap_NetInvestmentIncome
Other revenues	21,630us-gaap_OtherIncome	23,716us-gaap_OtherIncome	23,470us-gaap_OtherIncome
Net realized investment gains (losses):
Total other-than-temporary impairment (“OTTI”) (losses) recoveries	(18)us-gaap_ImpairmentOfInvestments	846us-gaap_ImpairmentOfInvestments	1,023us-gaap_ImpairmentOfInvestments
Portion of OTTI losses recognized in other comprehensive income	(132)	(1,151)	(2,364)
Net OTTI losses recognized in earnings	(150)	(305)	(1,341)
Other net investment gains	11,755	8,958	14,541
Total net realized investment gains (losses)	11,605us-gaap_RealizedInvestmentGainsLosses	8,653us-gaap_RealizedInvestmentGainsLosses	13,200us-gaap_RealizedInvestmentGainsLosses
Total revenues	708,780us-gaap_Revenues	860,267us-gaap_Revenues	664,662us-gaap_Revenues
Benefits and expenses:
Life and other policy benefits	54,295	60,050	51,842
Amortization of deferred policy acquisition costs	115,154	108,233	121,922
Universal life and annuity contract interest	298,259	454,594	262,339
Other operating expenses	83,551us-gaap_OtherCostAndExpenseOperating	95,693us-gaap_OtherCostAndExpenseOperating	87,978us-gaap_OtherCostAndExpenseOperating
Total benefits and expenses	551,259us-gaap_BenefitsLossesAndExpenses	718,570us-gaap_BenefitsLossesAndExpenses	524,081us-gaap_BenefitsLossesAndExpenses
Earnings before federal income taxes	157,521	141,697	140,581
Federal income taxes	51,933us-gaap_IncomeTaxExpenseBenefit	45,450us-gaap_IncomeTaxExpenseBenefit	48,023us-gaap_IncomeTaxExpenseBenefit
Net Earnings	105,588us-gaap_NetIncomeLoss	96,247us-gaap_NetIncomeLoss	92,558us-gaap_NetIncomeLoss
Common Class A [Member]
Benefits and expenses:
Net Earnings	102,602	93,524	89,940
Basic Earnings Per Share:
Earnings Per Share, Basic (in dollars per share)	$ 29.87	$ 27.23	$ 26.19
Diluted Earnings Per Share:
Earnings Per Share, Diluted (in dollars per share)	$ 29.85	$ 27.19	$ 26.19
Common Class B [Member]
Benefits and expenses:
Net Earnings	$ 2,986	$ 2,723	$ 2,618
Basic Earnings Per Share:
Earnings Per Share, Basic (in dollars per share)	$ 14.93	$ 13.61	$ 13.09
Diluted Earnings Per Share:
Earnings Per Share, Diluted (in dollars per share)	$ 14.93	$ 13.61	$ 13.09

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of life premiums earned.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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