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Reinsurance (List of direct, assumed and ceded Reinsurance Amounts) (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
Premiums Written:
Direct									$ 3,084,451	$ 2,890,633	$ 2,733,459
Assumed									24,339	26,250	26,685
Ceded premiums written									(429,366)	(402,597)	(389,503)
Net									2,679,424	2,514,286	2,370,641
Premiums Earned:
Direct									2,993,157	2,808,764	2,647,488
Assumed									24,399	25,831	25,831
Ceded premiums earned									(420,385)	(398,366)	(382,292)
Total Net Premiums Earned	$ 668,359	$ 653,620	$ 642,619	$ 632,573	$ 625,288	$ 614,277	$ 604,836	$ 591,828	2,597,171	2,436,229	2,291,027
Loss and loss expense incurred:
Direct									1,714,880	1,706,951	1,570,678
Assumed									22,879	21,469	17,588
Ceded loss and loss expense									(186,268)	(230,286)	(243,192)
Net									$ 1,551,491	$ 1,498,134	$ 1,345,074

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