Reinsurance - Schedule of Ceded Premiums Earned by Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Effects of Reinsurance [Line Items]
Ceded Premiums Written	$ (187,487)	$ (168,706)	$ (196,163)	$ (174,873)
Increase (Decrease) in Ceded Unearned Premiums	137,081	128,176	100,625	97,209
Ceded Premiums Earned	(50,406)	(40,530)	(95,538)	(77,664)
Excess of Loss Product Line
Effects of Reinsurance [Line Items]
Ceded Premiums Written	(177,970)	(162,993)	(182,027)	(165,119)
Equipment and Identity Theft Product Line
Effects of Reinsurance [Line Items]
Ceded Premiums Written	(2,201)	(1,604)	(3,777)	(2,798)
Flood Product Line
Effects of Reinsurance [Line Items]
Ceded Premiums Written	(4,920)	(4,109)	(7,963)	(6,956)
Novation of Auto Policies
Effects of Reinsurance [Line Items]
Ceded Premiums Written	$ (2,396)	$ 0	$ (2,396)	$ 0