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Supplemental Reinsurance Premiums (Schedule of Property and Liability Insurance Earned Premiums) (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
Supplementary Insurance Information [Abstract]
Direct amounts									$ 2,806,889us-gaap_DirectPremiumsEarned	$ 2,704,401us-gaap_DirectPremiumsEarned	$ 2,578,715us-gaap_DirectPremiumsEarned
Ceded to other companies									(11,185)us-gaap_CededPremiumsEarned	(7,059)us-gaap_CededPremiumsEarned	(5,066)us-gaap_CededPremiumsEarned
Assumed									491us-gaap_AssumedPremiumsEarned	845us-gaap_AssumedPremiumsEarned	1,271us-gaap_AssumedPremiumsEarned
Net amounts	$ 709,368us-gaap_PremiumsEarnedNet	$ 705,237us-gaap_PremiumsEarnedNet	$ 697,889us-gaap_PremiumsEarnedNet	$ 683,701us-gaap_PremiumsEarnedNet	$ 680,892us-gaap_PremiumsEarnedNet	$ 678,913us-gaap_PremiumsEarnedNet	$ 675,787us-gaap_PremiumsEarnedNet	$ 662,595us-gaap_PremiumsEarnedNet	$ 2,796,195us-gaap_PremiumsEarnedNet	$ 2,698,187us-gaap_PremiumsEarnedNet	$ 2,574,920us-gaap_PremiumsEarnedNet

Amount of earned premiums ceded to other entities.

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.