Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Premiums and other revenues:
Universal life and annuity contract charges	$ 38,345	$ 38,217	$ 75,658	$ 76,222
Traditional life premiums	5,162	5,169	9,509	9,440
Net investment income	102,259	155,179	202,182	263,630
Other revenues	5,194	5,211	10,523	10,974
Net realized investment gains (losses):
Total other-than-temporary impairment (“OTTI”) gains (losses)	(2)	0	158	(32)
Portion of OTTI (gains) losses recognized in other comprehensive income	(105)	0	(265)	(3)
Net OTTI losses recognized in earnings	(107)	0	(107)	(35)
Other net investment gains (losses)	4,365	3,065	5,343	4,613
Total net realized investment gains (losses)	4,258	3,065	5,236	4,578
Total condensed consolidated premiums and other revenues	155,218	206,841	303,108	364,844
Benefits and expenses:
Life and other policy benefits	16,120	14,796	35,386	27,759
Amortization of deferred policy acquisition costs	28,070	27,258	55,722	55,837
Universal life and annuity contract interest	49,431	102,429	98,470	165,365
Other operating expenses	18,802	19,500	39,312	42,963
Total benefits and expenses	112,423	163,983	228,890	291,924
Earnings before Federal income taxes	42,795	42,858	74,218	72,920
Federal income taxes	13,937	13,675	24,034	23,911
Net earnings	28,858	29,183	50,184	49,009
Common Class A [Member]
Benefits and expenses:
Net earnings	$ 28,042	$ 28,358	$ 48,765	$ 47,623
Basic earnings per share:
Earnings Per Share, Basic (in dollars per share)	$ 8.16	$ 8.26	$ 14.19	$ 13.86
Diluted earnings per share:
Earnings Per Share, Diluted (in dollars per share)	$ 8.16	$ 8.25	$ 14.19	$ 13.86
Common Class B [Member]
Benefits and expenses:
Net earnings	$ 816	$ 825	$ 1,419	$ 1,386
Basic earnings per share:
Earnings Per Share, Basic (in dollars per share)	$ 4.08	$ 4.13	$ 7.10	$ 6.93
Diluted earnings per share:
Earnings Per Share, Diluted (in dollars per share)	$ 4.08	$ 4.13	$ 7.10	$ 6.93