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Supplemental Reinsurance Premiums (Schedule of Property and Liability Insurance Earned Premiums) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]
Direct amounts									$ 3,416,687	$ 3,221,493	$ 3,146,864
Ceded to other companies									(48,941)	(26,881)	(15,846)
Assumed									665	825	755
Net amounts	$ 868,233	$ 858,135	$ 833,959	$ 808,084	$ 806,796	$ 801,205	$ 797,666	$ 789,770	$ 3,368,411	$ 3,195,437	$ 3,131,773

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