Reinsurance (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of the effect of reinsurance on premiums written and earned
Gross Written	$ 328,823	$ 272,101	$ 228,424
Gross Earned	306,994	264,896	239,430
Ceded Written	(16,305)	(13,881)	(20,549)
Ceded Earned	(16,305)	(13,881)	(20,549)
Net premiums Written	312,518	258,220	207,875
Net premiums Earned	$ 290,689	$ 251,015	$ 218,881

Premiums assumed and earned by another insurer as a result of reinsurance arrangements.

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