Condensed Consolidated Statements of Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Premium income	$ 66,357	$ 75,391	$ 244,678	$ 203,478
Fee income	154,307	135,160	301,253	262,103
Other revenue			7,355
Net investment income	248,603	296,086	533,965	593,267
Realized investment gains (losses), net:
Total other-than-temporary impairments	359		(61)	(254)
Other-than-temporary impairments transferred to other comprehensive income (loss)			(434)
Other realized investment gains, net	(24,673)	36,853	(9,080)	53,794
Total realized investment gains (losses), net	(24,314)	36,853	(9,575)	53,540
Total revenues	444,953	543,490	1,077,676	1,112,388
Benefits and expenses:
Life and other policy benefits	164,044	179,545	309,636	360,454
Increase (decrease) in future policy benefits	(32,985)	(57,657)	12,286	(58,288)
Interest paid or credited to contractholders	121,796	130,400	248,727	257,689
Provision for policyholders' share of earnings on participating business	(483)	558	4,496	2,188
Dividends to policyholders	12,868	11,775	34,720	32,725
Total benefits, net	265,240	264,621	609,865	594,768
General insurance expenses	163,704	151,858	322,182	291,615
Amortization of deferred acquisition costs and value of business acquired	14,797	16,601	30,304	32,491
Interest expense	9,335	9,351	18,673	18,690
Total benefits and expenses, net	453,076	442,431	981,024	937,564
Income (loss) before income taxes	(8,123)	101,059	96,652	174,824
Income tax expense (benefit)	(4,069)	35,034	33,872	58,876
Net income (loss)	$ (4,054)	$ 66,025	$ 62,780	$ 115,948