Reinsurance (Schedule of Catastrophe Losses by Size) (Details) (Catastrophe [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013 catastrophic_event		Sep. 30, 2012 catastrophic_event		Sep. 30, 2013 catastrophic_event		Sep. 30, 2012 catastrophic_event
Effects of Reinsurance [Line Items]
Number of catastrophic events	3		2		3		2
Catastrophic events, Combined Ratio Impact	0.30%		5.70%		2.70%		3.30%
Catastrophic Event, Incurred Loss and LAE	$ 127	[1]	$ 1,730	[1]	$ 3,722	[1]	$ 2,885	[1]
$1 million to $5 million [Member]
Effects of Reinsurance [Line Items]
Number of catastrophic events	0		1	[2]	1	[3]	2	[3]
Catastrophic events, Combined Ratio Impact	0.00%				1.40%	[3]	3.30%	[3]
Catastrophic Event, Incurred Loss and LAE	0	[1]	1,529	[1],[2]	1,904	[1],[3]	2,885	[1],[3]
Less than $1 million [Member]
Effects of Reinsurance [Line Items]
Number of catastrophic events	3	[4]	1		2	[5]	0	[5]
Catastrophic events, Combined Ratio Impact	0.30%	[4]	0.60%		1.30%	[5]	0.00%	[5]
Catastrophic Event, Incurred Loss and LAE	127	[1],[4]	201	[1]	1,818	[1],[5]	0	[1],[5]
Minimum [Member] | $1 million to $5 million [Member]
Effects of Reinsurance [Line Items]
Catastrophic events, size of losses	1,000		1,000		1,000		1,000
Maximum [Member] | $1 million to $5 million [Member]
Effects of Reinsurance [Line Items]
Catastrophic events, size of losses	5,000		5,000		5,000		5,000
Maximum [Member] | Less than $1 million [Member]
Effects of Reinsurance [Line Items]
Catastrophic events, size of losses	$ 1		$ 1		$ 1		$ 1

[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 Tropical Storm Isaac in 2012.

[3] Reflects losses from Winterstorm Nemo in 2013 and Tropical Storms Debby and Isaac in 2012.

[4] Reflects losses from Winterstorm Nemo, the Orlando weather event in March and Tropical Storm Andrea in June 2013, and Tropical Storm Debby in 2012.

[5] Reflects losses from the Orlando weather event and Tropical Storm Andrea in 2013.