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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Premiums Written:                      
Direct                 $ 2,403,519 $ 2,228,270 $ 2,133,793
Assumed                 23,848 26,306 43,650
Ceded premiums written                 (357,463) (369,296) (367,284)
Net                 2,069,904 1,885,280 1,810,159
Premiums Earned:                      
Direct                 2,330,267 2,183,258 2,048,530
Assumed                 23,209 34,653 44,464
Ceded premiums earned                 (363,567) (365,302) (356,922)
Total Net Premiums Earned $ 516,087 $ 507,390 $ 490,309 $ 476,123 $ 469,850 $ 462,639 $ 463,625 $ 456,495 1,989,909 1,852,609 1,736,072
Losses and loss expenes incurred:                      
Direct                 1,274,872 1,314,864 1,370,293
Assumed                 16,996 26,187 32,678
Ceded losses and loss expenses incurred                 (143,327) (183,550) (281,233)
Net                 $ 1,148,541 $ 1,157,501 $ 1,121,738