Concentration of Operations (Details 1) (USD $) In Thousands, 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
Net premiums earned for the top ten states
Premiums earned	$ 78,741	$ 72,425	$ 69,733	$ 69,790	$ 66,211	$ 64,454	$ 60,261	$ 60,089	$ 290,689	$ 251,015	$ 218,881
Premium earned percentage									100.00%	100.00%	100.00%
Louisiana [Member]
Net premiums earned for the top ten states
Premiums earned									31,134	28,157	23,406
Premium earned percentage									10.70%	11.20%	10.70%
Georgia [Member]
Net premiums earned for the top ten states
Premiums earned									25,033	21,496	19,308
Premium earned percentage									8.60%	8.60%	8.80%
Pennsylvania [Member]
Net premiums earned for the top ten states
Premiums earned									24,480	19,265	16,784
Premium earned percentage									8.40%	7.70%	7.70%
North Carolina [Member]
Net premiums earned for the top ten states
Premiums earned									20,036	17,071	17,038
Premium earned percentage									6.90%	6.80%	7.80%
Illinois [Member]
Net premiums earned for the top ten states
Premiums earned									18,119	14,673	14,294
Premium earned percentage									6.20%	5.80%	6.50%
Oklahoma [Member]
Net premiums earned for the top ten states
Premiums earned									16,157	16,037	14,544
Premium earned percentage									5.60%	6.40%	6.60%
Virginia [Member]
Net premiums earned for the top ten states
Premiums earned									16,144	15,660	13,680
Premium earned percentage									5.60%	6.20%	6.30%
Texas [Member]
Net premiums earned for the top ten states
Premiums earned									11,687	11,073	8,858
Premium earned percentage									4.00%	4.40%	4.00%
Kansas [Member]
Net premiums earned for the top ten states
Premiums earned									10,925	9,486	7,126
Premium earned percentage									3.80%	3.80%	3.30%
Minnesota [Member]
Net premiums earned for the top ten states
Premiums earned									10,094	9,388	7,887
Premium earned percentage									3.50%	3.70%	3.60%
All Others [Member]
Net premiums earned for the top ten states
Premiums earned									$ 106,880	$ 88,709	$ 75,956
Premium earned percentage									36.70%	35.40%	34.70%