Investments (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Q	Mar. 31, 2013	Dec. 31, 2013
Estimated Fair Value
Estimated Fair Value, Less than 12 Months	$ 198,991		$ 282,158
Estimated Fair Value, 12 Months or More	48,963		47,670
Estimated Fair Value, Total	247,954		329,828
Unrealized Losses
Unrealized Losses, Less than 12 Months	3,753		7,810
Unrealized Losses, 12 Months or More	1,718		2,024
Unrealized Losses, Total	5,471		9,834
Other-Than-Temporary Impairments
Securities held with a material (20% or greater) unrealized loss for four or more consecutive quarters	0
Material loss threshold, percentage	20.00%
Material loss threshold, number of consecutive quarters	4
OTTI charges	0	0
Amounts included in accumulated other comprehensive income related to OTTI securities	0		0
Subtotal, fixed maturity securities
Estimated Fair Value
Estimated Fair Value, Less than 12 Months	194,029		278,225
Estimated Fair Value, 12 Months or More	48,633		47,371
Estimated Fair Value, Total	242,662		325,596
Unrealized Losses
Unrealized Losses, Less than 12 Months	3,559		7,737
Unrealized Losses, 12 Months or More	1,712		2,013
Unrealized Losses, Total	5,271		9,750
U.S. Treasury securities
Estimated Fair Value
Estimated Fair Value, Less than 12 Months	1,503		1,503
Estimated Fair Value, Total	1,503		1,503
Unrealized Losses
Unrealized Losses, Less than 12 Months	7		7
Unrealized Losses, Total	7		7
Obligations of states and political subdivisions
Estimated Fair Value
Estimated Fair Value, Less than 12 Months	65,313		131,114
Estimated Fair Value, 12 Months or More	3,465		3,362
Estimated Fair Value, Total	68,778		134,476
Unrealized Losses
Unrealized Losses, Less than 12 Months	1,244		3,898
Unrealized Losses, 12 Months or More	167		281
Unrealized Losses, Total	1,411		4,179
Residential mortgage-backed securities
Estimated Fair Value
Estimated Fair Value, Less than 12 Months	39,518		50,048
Estimated Fair Value, 12 Months or More	35,997		37,166
Estimated Fair Value, Total	75,515		87,214
Unrealized Losses
Unrealized Losses, Less than 12 Months	965		1,570
Unrealized Losses, 12 Months or More	1,412		1,660
Unrealized Losses, Total	2,377		3,230
Commercial mortgage-backed securities
Estimated Fair Value
Estimated Fair Value, Less than 12 Months	6,504		6,008
Estimated Fair Value, Total	6,504		6,008
Unrealized Losses
Unrealized Losses, Less than 12 Months	14		8
Unrealized Losses, Total	14		8
Other asset-backed securities
Estimated Fair Value
Estimated Fair Value, Less than 12 Months	3,251		3,240
Estimated Fair Value, 12 Months or More	4,613		4,608
Estimated Fair Value, Total	7,864		7,848
Unrealized Losses
Unrealized Losses, Less than 12 Months	19		31
Unrealized Losses, 12 Months or More	1		5
Unrealized Losses, Total	20		36
Corporate and other securities
Estimated Fair Value
Estimated Fair Value, Less than 12 Months	77,940		86,312
Estimated Fair Value, 12 Months or More	4,558		2,235
Estimated Fair Value, Total	82,498		88,547
Unrealized Losses
Unrealized Losses, Less than 12 Months	1,310		2,223
Unrealized Losses, 12 Months or More	132		67
Unrealized Losses, Total	1,442		2,290
Equity securities
Estimated Fair Value
Estimated Fair Value, Less than 12 Months	4,962		3,933
Estimated Fair Value, 12 Months or More	330		299
Estimated Fair Value, Total	5,292		4,232
Unrealized Losses
Unrealized Losses, Less than 12 Months	194		73
Unrealized Losses, 12 Months or More	6		11
Unrealized Losses, Total	200		84
Subprime mortgage debt securities
Other-Than-Temporary Impairments
Securities held	$ 0