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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Premiums Written:                      
Direct                 $ 2,577,259 $ 2,403,519 $ 2,228,270
Assumed                 28,779 23,848 26,306
Ceded premiums written                 (368,750) (357,463) (369,296)
Net                 2,237,288 2,069,904 1,885,280
Premiums Earned:                      
Direct                 2,484,715 2,330,267 2,183,258
Assumed                 28,214 23,209 34,653
Ceded premiums earned                 (363,357) (363,567) (365,302)
Total Net Premiums Earned $ 552,753 $ 542,429 $ 531,932 $ 522,458 $ 516,087 $ 507,390 $ 490,309 $ 476,123 2,149,572 1,989,909 1,852,609
Losses and loss expenes incurred:                      
Direct                 1,560,356 1,274,872 1,314,864
Assumed                 22,708 16,996 26,187
Ceded losses and loss expenses incurred                 (348,267) (143,327) (183,550)
Net                 $ 1,234,797 $ 1,148,541 $ 1,157,501