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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Premiums written:
Direct	$ 766,394	$ 714,234
Assumed	6,555	6,271
Ceded	(100,002)	(95,945)
Net	672,947	624,560
Premiums earned:
Direct	728,037	683,733
Assumed	6,562	6,124
Ceded	(102,026)	(98,029)
Net	632,573	591,828
Loss and loss expenses incurred:
Direct	424,657	420,916
Assumed	5,265	8,004
Ceded	(43,343)	(43,979)
Net	$ 386,579	$ 384,941

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