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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]
Direct amounts									$ 3,655,233	$ 3,416,687	$ 3,221,493
Ceded to other companies									(56,725)	(48,941)	(26,881)
Assumed									910	665	825
Net amounts	$ 925,384	$ 915,012	$ 888,776	$ 870,245	$ 868,233	$ 858,135	$ 833,959	$ 808,084	$ 3,599,418	$ 3,368,411	$ 3,195,437

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