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Schedule IV - Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
 [1]
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Direct Amount                 $ 2,808,764 $ 2,647,488 $ 2,484,715
Assumed From Other Companies                 25,831 25,831 28,214
Ceded to Other Companies                 398,366 382,292 363,357
Total Net Premiums Earned $ 625,288 $ 614,277 $ 604,836 $ 591,828 $ 590,088 $ 572,055 $ 568,030 $ 560,854 $ 2,436,229 $ 2,291,027 $ 2,149,572
Percentage of Amount Assumed to Net                 1.00% 1.00% 1.00%
Accident and Health Insurance Segment [Member]                      
Direct Amount                 $ 19 $ 24 $ 32
Assumed From Other Companies                 0 0 0
Ceded to Other Companies                 19 24 0
Total Net Premiums Earned                 $ 0 $ 0 $ 32
Percentage of Amount Assumed to Net                 0.00% 0.00% 0.00%
Property and liability insurance [Member]                      
Direct Amount                 $ 2,808,745 $ 2,647,464 $ 2,484,683
Assumed From Other Companies                 25,831 25,831 28,214
Ceded to Other Companies                 398,347 382,268 363,357
Total Net Premiums Earned                 $ 2,436,229 $ 2,291,027 $ 2,149,540
Percentage of Amount Assumed to Net                 1.00% 1.00% 1.00%
[1] Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.