Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other intangible assets
Net book value	$ 18,249	$ 21,855
Amortization expense included in general insurance expenses	3,606	3,787	3,990
Future amortization of other intangible assets
2013	2,700
2014	2,700
2015	2,700
2016	2,700
2017	2,700
Retirement Services Segment
Other intangible assets
Gross carrying amount	44,284	44,284
Accumulated amortization	(26,035)	(22,429)
Net book value	18,249	21,855
Retirement Services Segment | Customer relationships
Other intangible assets
Gross carrying amount	36,314	36,314
Accumulated amortization	(18,065)	(15,234)
Net book value	18,249	21,080
Retirement Services Segment | Preferred provider agreements
Other intangible assets
Gross carrying amount	7,970	7,970
Accumulated amortization	(7,970)	(7,195)
Net book value		$ 775