Ceded Premiums Earned by type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Ceded Premiums Earned by type [Line Items]
Ceded Premiums Written	$ (183,808)	$ (144,404)	$ (124,682)
Increase (Decrease) in Ceded Unearned Premiums	15,551	8,559	5,352
Ceded Premiums Earned	(168,257)	(135,845)	(119,330)
Excess of Loss Product Line [Member]
Ceded Premiums Earned by type [Line Items]
Ceded Premiums Written	(163,106)	(125,638)	(108,696)
Equipment and Identity Theft Product Line [Member]
Ceded Premiums Earned by type [Line Items]
Ceded Premiums Written	(6,169)	(4,370)	(2,608)
Flood Product Line [Member]
Ceded Premiums Earned by type [Line Items]
Ceded Premiums Written	$ (14,533)	$ (14,396)	$ (13,378)