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Schedule IV - Reinsurance (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
Direct Amount									$ 2,993,157	$ 2,808,764	$ 2,647,488
Assumed From Other Companies									24,399	25,831	25,831
Ceded to Other Companies									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
Percentage of Amount Assumed to Net									1.00%	1.00%	1.00%
Accident and Health Insurance Segment [Member]
Direct Amount									$ 17	$ 19	$ 24
Assumed From Other Companies									0	0	0
Ceded to Other Companies									17	19	24
Total Net Premiums Earned									$ 0	$ 0	$ 0
Percentage of Amount Assumed to Net									0.00%	0.00%	0.00%
Property and liability insurance [Member]
Direct Amount									$ 2,993,140	$ 2,808,745	$ 2,647,464
Assumed From Other Companies									24,399	25,831	25,831
Ceded to Other Companies									420,368	398,347	382,268
Total Net Premiums Earned									$ 2,597,171	$ 2,436,229	$ 2,291,027
Percentage of Amount Assumed to Net									1.00%	1.00%	1.00%

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