Reinsurance - Schedule of Catastrophe Losses by Event Magnitude (Details) - Catastrophe		3 Months Ended				9 Months Ended
		Sep. 30, 2015 USD ($) catastrophic_event		Sep. 30, 2014 USD ($) catastrophic_event		Sep. 30, 2015 USD ($) catastrophic_event		Sep. 30, 2014 USD ($) catastrophic_event
Liability for Catastrophe Claims
Number of catastrophic events | catastrophic_event		13		3		13		3
Incurred loss and LAE	[1]	$ 3,808,000		$ 714,000		$ 25,585,000		$ 974,000
Combined ratio impact		4.50%		1.10%		10.60%		0.50%
Catastrophe Loss Size, Range 3
Liability for Catastrophe Claims
Number of catastrophic events | catastrophic_event	[2]					2		0
Incurred loss and LAE	[2]					$ 11,342,000	[1]	$ 0
Combined ratio impact	[2]					4.70%		0.00%
Catastrophe Loss Size Range 2
Liability for Catastrophe Claims
Number of catastrophic events | catastrophic_event		1	[3]	0	[3]	6	[4]	0	[4]
Incurred loss and LAE	[1]	$ 2,420,000	[3]	$ 0	[3]	$ 12,275,000	[4]	$ 0	[3]
Combined ratio impact		2.80%	[3]	0.00%	[3]	5.10%	[4]	0.00%	[4]
Catastrophe Loss Size Range 1
Liability for Catastrophe Claims
Number of catastrophic events | catastrophic_event	[5]	12		3		5		3
Incurred loss and LAE	[1],[5]	$ 1,388,000		$ 714,000		$ 1,968,000		$ 974,000
Combined ratio impact	[5]	1.70%		1.10%		0.80%		0.50%
Minimum | Catastrophe Loss Size, Range 3
Liability for Catastrophe Claims
Size of catastrophic losses		$ 5,000,000		$ 5,000,000		$ 5,000,000		$ 5,000,000
Minimum | Catastrophe Loss Size Range 2
Liability for Catastrophe Claims
Size of catastrophic losses		1,000,000		1,000,000		1,000,000		1,000,000
Maximum | Catastrophe Loss Size, Range 3
Liability for Catastrophe Claims
Size of catastrophic losses		10,000,000		10,000,000		10,000,000		10,000,000
Maximum | Catastrophe Loss Size Range 2
Liability for Catastrophe Claims
Size of catastrophic losses		5,000,000		5,000,000		5,000,000		5,000,000
Maximum | Catastrophe Loss Size Range 1
Liability for Catastrophe Claims
Size of catastrophic losses		$ 1,000,000		$ 1,000,000		$ 1,000,000		$ 1,000,000

[1] Incurred loss and LAE is equal to losses and LAE paid plus the change in case and incurred but not reported reserves.

[2] Reflects losses from winter storms in 2015.

[3] Reflects losses from a wind storm in 2015.

[4] Reflects losses from winter storms, hail storms and wind storms in 2015.

[5] Reflects losses from winter storms, hail storms, Texas flooding, Hurricane Anna and Tropical Storm Bill in 2015 and losses from the Richland hail storm, Hurricane Arthur and the Revere Tornado in 2014.