Reinsurance - Schedule of Catastrophe Losses by Event Magnitude (Details) - Catastrophe		3 Months Ended		6 Months Ended
		Jun. 30, 2015 USD ($) catastrophic_event	Jun. 30, 2014 USD ($) catastrophic_event	Jun. 30, 2015 USD ($) catastrophic_event	Jun. 30, 2014 USD ($) catastrophic_event
Liability for Catastrophe Claims
Number of catastrophic events | catastrophic_event		12	1	12	1
Incurred loss and LAE	[1]	$ 6,517,000	$ 260,000	$ 21,777,000	$ 260,000
Combined ratio impact		8.10%	0.40%	13.70%	0.20%
Catastrophe Loss Size Range 2
Liability for Catastrophe Claims
Number of catastrophic events | catastrophic_event	[2]	7	0	7	0
Incurred loss and LAE	[1],[2]	$ 4,696,000	$ 0	$ 19,956,000	$ 0
Combined ratio impact	[2]	5.80%	0.00%	12.60%	0.00%
Catastrophe Loss Size Range 1
Liability for Catastrophe Claims
Number of catastrophic events | catastrophic_event	[3]	5	1	5	1
Incurred loss and LAE	[1],[3]	$ 1,821,000	$ 260,000	$ 1,821,000	$ 260,000
Combined ratio impact	[3]	2.30%	0.40%	1.10%	0.20%
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 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 and hail storms in 2015.

[3] Reflects losses from hail storms, Texas flooding and Tropical Storm Bill in 2015 and losses from the Richland hail storm in June 2014.