Condensed Consolidated Statements of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Premiums and other revenues:
Universal life and annuity contract charges	$ 37,313us-gaap_InsuranceCommissionsAndFees	$ 38,005us-gaap_InsuranceCommissionsAndFees
Traditional life premiums	4,347us-gaap_PremiumsEarnedNetLife	4,271us-gaap_PremiumsEarnedNetLife
Net investment income	99,923us-gaap_NetInvestmentIncome	108,451us-gaap_NetInvestmentIncome
Other revenues	5,329us-gaap_OtherIncome	5,763us-gaap_OtherIncome
Net realized investment gains (losses):
Total other-than-temporary impairment (“OTTI”) gains (losses)	160us-gaap_ImpairmentOfInvestments	(32)us-gaap_ImpairmentOfInvestments
Portion of OTTI (gains) losses recognized in other comprehensive income	(160)	(3)
Net OTTI losses recognized in earnings	0	(35)
Other net investment gains (losses)	978	1,548
Total net realized investment gains (losses)	978us-gaap_RealizedInvestmentGainsLosses	1,513us-gaap_RealizedInvestmentGainsLosses
Total condensed consolidated premiums and other revenues	147,890us-gaap_Revenues	158,003us-gaap_Revenues
Benefits and expenses:
Life and other policy benefits	19,266	12,963
Amortization of deferred policy acquisition costs	27,652	28,579
Universal life and annuity contract interest	49,039	62,936
Other operating expenses	20,510us-gaap_OtherCostAndExpenseOperating	23,463us-gaap_OtherCostAndExpenseOperating
Total benefits and expenses	116,467us-gaap_BenefitsLossesAndExpenses	127,941us-gaap_BenefitsLossesAndExpenses
Earnings before Federal income taxes	31,423	30,062
Federal income taxes	10,097us-gaap_IncomeTaxExpenseBenefit	10,236us-gaap_IncomeTaxExpenseBenefit
Net earnings	21,326us-gaap_NetIncomeLoss	19,826us-gaap_NetIncomeLoss
Common Class A [Member]
Benefits and expenses:
Net earnings	20,723	19,265
Basic earnings per share:
Earnings Per Share, Basic (in dollars per share)	$ 6.03	$ 5.61
Diluted earnings per share:
Earnings Per Share, Diluted (in dollars per share)	$ 6.03	$ 5.61
Common Class B [Member]
Benefits and expenses:
Net earnings	$ 603	$ 561
Basic earnings per share:
Earnings Per Share, Basic (in dollars per share)	$ 3.02	$ 2.80
Diluted earnings per share:
Earnings Per Share, Diluted (in dollars per share)	$ 3.02	$ 2.80

The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.

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