Goodwill and Other Intangible Assets (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Aug. 29, 2014
Goodwill and other intangible assets
Net book value	$ 27,915,000		$ 15,155,000
Amortization expense included in general insurance expenses	3,531,000		3,094,000	3,606,000
Intangible assets with indefinite lives	0
Future amortization of other intangible assets
2015	3,200,000
2016	3,200,000
2017	3,200,000
2018	3,200,000
2019	3,200,000
Retirement Services segment
Goodwill and other intangible assets
Gross carrying amount	52,605,000
Accumulated amortization	(24,690,000)
Net book value	27,915,000
Retirement Services segment | Customer relationships
Goodwill and other intangible assets
Gross carrying amount	51,280,000	[1]	36,314,000		14,966,000	[1]
Accumulated amortization	(24,481,000)	[1]	(21,159,000)
Net book value	26,799,000	[1]	15,155,000
Retirement Services segment | NonCompete
Goodwill and other intangible assets
Gross carrying amount	1,325,000	[1]			1,325,000	[1]
Accumulated amortization	(209,000)	[1]
Net book value	$ 1,116,000	[1]

[1] 2014, the Company acquired $14,966 and $1,325 of customer relationship and non-competition intangible assets, respectively, from the acquisition of RPS. See Note 2 for additional discussion regarding the acquisition.