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Schedule IV - Reinsurance (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Direct Amount									$ 2,183,258us-gaap_DirectPremiumsEarned	$ 2,048,530us-gaap_DirectPremiumsEarned	$ 1,873,007us-gaap_DirectPremiumsEarned
Assumed From Other Companies									34,653us-gaap_AssumedPremiumsEarned	44,464us-gaap_AssumedPremiumsEarned	65,884us-gaap_AssumedPremiumsEarned
Ceded to Other Companies									365,302us-gaap_CededPremiumsEarned	356,922us-gaap_CededPremiumsEarned	354,772us-gaap_CededPremiumsEarned
Total Net Premiums Earned	469,850	462,639	463,625	456,495	451,312	437,568	426,252	420,940	1,852,609	1,736,072	1,584,119
Percentage of amount assumed to net									2.00%us-gaap_PremiumsPercentageAssumedToNet	3.00%us-gaap_PremiumsPercentageAssumedToNet	4.00%us-gaap_PremiumsPercentageAssumedToNet
Accident and Health Insurance Segment [Member]
Direct Amount									44	55	58
Assumed From Other Companies									0	0	0
Ceded to Other Companies									44	55	58
Total Net Premiums Earned									0	0	0
Percentage of amount assumed to net									0.00%	0.00%	0.00%
Property and liability insurance [Member]
Direct Amount									2,183,214	2,048,475	1,872,949
Assumed From Other Companies									34,653	44,464	65,884
Ceded to Other Companies									365,258	356,867	354,714
Total Net Premiums Earned									$ 1,852,609	$ 1,736,072	$ 1,584,119
Percentage of amount assumed to net									2.00%	3.00%	4.00%

- Definition

Amount of earned premiums ceded to other entities.

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