Summary of Significant Accounting Policies Accounting Pronouncements (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred acquisition costs	$ 135,569				$ 124,542				$ 135,569	$ 124,542
Deferred federal income taxes	(57,489)				(50,565)				(57,489)	(50,565)
Accumulated deficit	(17,335)				(21,851)				(17,335)	(21,851)
Capitalization of deferred policy acquisition costs									(29,074)	(27,826)	(26,172)
Amortization of deferred policy acquisition costs									17,845	16,848	17,293
Federal income tax expense	(144)	1,134	(64)	581	(119)	729	1,369	869	1,507	2,848	3,685
Net income	(297)	2,911	403	1,512	1,798	2,053	3,009	1,622	4,529	8,482	14,704
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred acquisition costs					136,300					136,300
Deferred federal income taxes					18,055					18,055
Accumulated deficit					(14,208)					(14,208)
Capitalization of deferred policy acquisition costs										(29,433)	(27,960)
Amortization of deferred policy acquisition costs										18,620	17,840
Federal income tax expense										2,790	4,119
Net income										8,375	15,511
Impact of Change in Accounting Principle [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred acquisition costs					(11,758)					(11,758)
Deferred federal income taxes					(4,115)					(4,115)
Accumulated deficit					(7,643)					(7,643)
Capitalization of deferred policy acquisition costs										1,607	1,788
Amortization of deferred policy acquisition costs										(1,772)	(547)
Federal income tax expense										58	(434)
Net income										$ 107	$ (807)
Common Class A [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basic earnings per share	$ (0.01)	$ 0.06	$ 0.01	$ 0.03	$ 0.04	$ 0.04	$ 0.06	$ 0.03		$ 0.17	$ 0.30
Diluted earnings per share	$ (0.01)	$ 0.06	$ 0.01	$ 0.03	$ 0.04	$ 0.04	$ 0.04	$ 0.03		$ 0.17	$ 0.30
Common Class A [Member] | Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basic earnings per share										$ 0.17	$ 0.32
Diluted earnings per share										$ 0.17	$ 0.32
Common Class A [Member] | Impact of Change in Accounting Principle [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basic earnings per share										$ 0.00	$ (0.02)
Diluted earnings per share										$ 0.00	$ (0.02)