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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, 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
Premiums Written:                      
Direct                 $ 2,890,633 $ 2,733,459 $ 2,577,259
Assumed                 26,250 26,685 28,779
Ceded premiums written                 (402,597) (389,503) (368,750)
Net                 2,514,286 2,370,641 2,237,288
Premiums Earned:                      
Direct                 2,808,764 2,647,488 2,484,715
Assumed                 25,831 25,831 28,214
Ceded premiums earned                 (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
Loss and loss expense incurred:                      
Direct                 1,706,951 1,570,678 1,560,356
Assumed                 21,469 17,588 22,708
Ceded loss and loss expense                 (230,286) (243,192) (348,267)
Net                 $ 1,498,134 $ 1,345,074 $ 1,234,797
[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.