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Investments (Net Investment Income) (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
Statement [Line Items]                      
Net investment income earned $ 54,109 $ 52,443 $ 45,553 $ 43,231 $ 42,587 $ 40,446 $ 41,430 $ 37,419 $ 195,336 $ 161,882 $ 130,754
Fixed Income Securities [Member]                      
Statement [Line Items]                      
Net investment income earned                 178,104 153,230 129,306
Equity Securities [Member]                      
Statement [Line Items]                      
Net investment income earned                 7,764 6,442 7,368
Short-term Investments [Member]                      
Statement [Line Items]                      
Net investment income earned                 3,472 1,526 686
Other Investment Portfolio [Member]                      
Statement [Line Items]                      
Net investment income earned                 17,799 12,871 2,940
Investment Expenses [Member]                      
Statement [Line Items]                      
Net investment income earned                 $ (11,803) $ (12,187) $ (9,546)
[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.