4. Net Realized Investment Gains (Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Realized Investment Gains Losses Details
Total other-than-temporary debt impairment losses	$ (3,003)	$ (782)	$ (4,089)	$ (1,662)
Portion of loss recognized in OCI	2,390	346	2,817	732
Net debt impairment losses recognized in earnings	(613)	(436)	(1,272)	(930)
Debt security impairments:
U.S. government and agency	0	0	0	0
State and political subdivision	0	0	0	0
Foreign government	0	0	0	0
Corporate	0	0	0	(250)
CMBS	0	0	(88)	0
RMBS	(549)	(377)	(1,070)	(621)
CDO/CLO	(26)	0	(26)	0
Other asset-backed	(38)	(59)	(88)	(59)
Net debt security impairments	(613)	(436)	(1,272)	(930)
Limited partnerships and other investment impairments	0	0	0	0
Net OTTI losses recognized in earnings	(613)	(436)	(1,272)	(930)
Debt security transaction gains	151	1,596	258	2,227
Debt security transaction losses	(36)	(260)	(84)	(585)
Limited partnerships and other investment gains	0	0	0	0
Limited partnerships and other investment losses	0	0	0	0
Net transaction gains	115	1,336	174	1,642
Derivative instruments	5,848	1,470	(17,680)	(11,871)
Embedded derivatives	(12,394)	(4,559)	3,962	4,508
Net realized investment gains (losses), excluding OTTI losses	(6,431)	(1,753)	(13,544)	(5,721)
Net realized investment gains (losses), excluding impairment losses	$ (7,044)	$ (2,189)	$ (14,816)	$ (6,651)