Segment Information (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Other operating expenses	$ (4,324)	$ (2,041)	$ (12,958)	$ (5,762)
Net investment income	9,510	9,996	34,496	33,189
Net realized investment (losses) gains	(17)	2,033	(2,473)	(1,678)
Amortization of intangible assets	(149)	(149)	(447)	(447)
Interest expense	$ (1,769)	$ (1,557)	$ (5,217)	$ (4,661)
Corporate and Other
Segment Reporting Information [Line Items]
Underwriting profit of insurance segments
Other operating expenses	$ (4,324)	$ (2,041)	$ (12,958)	$ (5,762)
Net investment income	(364)	674	5,731	5,505
Interest expense	(1,769)	(1,557)	(5,217)	(4,661)
Reportable segments
Segment Reporting Information [Line Items]
Underwriting profit of insurance segments	17,785	13,212	31,676	21,477
Underwriting profit	13,461	11,171	18,718	15,715
Net investment income	9,510	9,996	34,496	33,189
Net realized investment (losses) gains	(17)	2,033	(2,473)	(1,678)
Amortization of intangible assets	(149)	(149)	(447)	(447)
Other income and expenses	(5)	(2,442)	(28)	(2,673)
Interest expense	(1,769)	(1,557)	(5,217)	(4,661)
Income before taxes	21,031	19,052	45,049	39,445
Reportable segments | Excess and Surplus Lines
Segment Reporting Information [Line Items]
Underwriting profit of insurance segments	17,047	13,033	30,259	21,931
Net investment income	$ 3,394	$ 3,472	$ 10,466	$ 10,496
Interest expense
Reportable segments | Specialty Admitted Insurance
Segment Reporting Information [Line Items]
Underwriting profit of insurance segments	$ 462	$ 162	$ 506	$ (878)
Net investment income	$ 618	$ 581	$ 1,720	$ 1,747
Interest expense
Reportable segments | Casualty Reinsurance
Segment Reporting Information [Line Items]
Underwriting profit of insurance segments	$ 276	$ 17	$ 911	$ 424
Net investment income	$ 5,862	$ 5,269	$ 16,579	$ 15,441
Interest expense