Reinsurance (Schedule of Catastrophe Losses by Size) (Details) (Catastrophe [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013 catastrophic_event		Jun. 30, 2012 catastrophic_event		Jun. 30, 2013 catastrophic_event		Jun. 30, 2012 catastrophic_event
Effects of Reinsurance [Line Items]
Number of catastrophic events	3		1		3		1
Catastrophic events, Combined Ratio Impact	3.90%		3.90%		4.10%		2.00%
Catastrophic Event, Incurred Loss and LAE	$ 1,777	[1]	$ 1,155	[1]	$ 3,595	[1]	$ 1,155	[1]
$1 million to $5 million [Member]
Effects of Reinsurance [Line Items]
Number of catastrophic events	0		1	[2]	1	[3]	1	[3]
Catastrophic events, Combined Ratio Impact	0.00%		3.90%	[2]	2.20%	[3]	2.00%	[3]
Catastrophic Event, Incurred Loss and LAE	0	[1]	1,155	[1],[2]	1,900	[1],[3]	1,155	[1],[3]
Less than $1 million [Member]
Effects of Reinsurance [Line Items]
Number of catastrophic events	3	[4]	0		2	[5]	0	[5]
Catastrophic events, Combined Ratio Impact	3.90%	[4]	0.00%		1.90%	[5]	0.00%	[5]
Catastrophic Event, Incurred Loss and LAE	1,777	[1],[4]	0	[1]	1,695	[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 incurred but not reported reserves.

[2] Reflects losses from Tropical Storm Debby in 2012.

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

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

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