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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred policy acquisition costs $ 252,612       $ 235,055       $ 252,612 $ 235,055 $ 222,564
Reserve for loss and loss expenses 3,893,868       3,771,240       3,893,868 3,771,240 3,691,719
Unearned premiums 1,431,932       1,349,644       1,431,932 1,349,644 1,262,819
Net premiums earned                 2,436,229 2,291,027 2,149,572
Net investment income                 140,413 168,241 125,817
Loss and loss expense incurred                 1,498,134 1,345,074 1,234,797
Amortization of deferred policy acquisition costs                 495,042 469,236 450,328
Other operating expenses                 321,880 322,381 312,514
Net premiums written                 2,514,286 2,370,641 2,237,288
Other insurance expenses                 331,318 333,097 321,395
Other income (1,542) [1] $ (2,538) $ (3,179) $ (2,179) (2,190) [1] $ (1,994) $ (3,291) $ (3,241) (9,438) (10,716) (8,881)
Standard Commercial Lines [Member]                      
Deferred policy acquisition costs 206,391       193,408       206,391 193,408 181,193
Reserve for loss and loss expenses 3,283,531       3,165,217       3,283,531 3,165,217 3,098,554
Unearned premiums 1,020,054       956,173       1,020,054 956,173 884,976
Net premiums earned                 1,912,222 1,788,499 1,665,483
Net investment income                 0 0 0
Loss and loss expense incurred                 1,141,038 1,008,150 913,506
Amortization of deferred policy acquisition costs                 412,420 387,552 367,813
Other operating expenses                 249,660 243,283 237,729
Net premiums written                 1,975,683 1,858,735 1,745,782
Standard Personal Lines [Member]                      
Deferred policy acquisition costs 18,070       16,952       18,070 16,952 16,664
Reserve for loss and loss expenses 223,223       263,166       223,223 263,166 286,081
Unearned premiums 304,085       295,435       304,085 295,435 282,111
Net premiums earned                 304,441 289,701 280,607
Net investment income                 0 0 0
Loss and loss expense incurred                 206,752 189,294 177,749
Amortization of deferred policy acquisition costs                 33,617 32,542 34,105
Other operating expenses                 51,308 56,761 56,334
Net premiums written                 309,277 296,775 281,822
Excess And Surplus Operations [Member]                      
Deferred policy acquisition costs 28,151       24,695       28,151 24,695 24,707
Reserve for loss and loss expenses 387,114       342,857       387,114 342,857 307,084
Unearned premiums 107,793       98,036       107,793 98,036 95,732
Net premiums earned                 219,566 212,827 203,482
Net investment income                 0 0 0
Loss and loss expense incurred                 150,344 147,630 143,542
Amortization of deferred policy acquisition costs                 49,005 49,142 48,410
Other operating expenses                 20,912 22,337 18,451
Net premiums written                 229,326 215,131 209,684
Investments Segment [Member]                      
Deferred policy acquisition costs 0       0       0 0 0
Reserve for loss and loss expenses 0       0       0 0 0
Unearned premiums $ 0       $ 0       0 0 0
Net premiums earned                 0 0 0
Net investment income                 140,413 168,241 125,817
Loss and loss expense incurred                 0 0 0
Amortization of deferred policy acquisition costs                 0 0 0
Other operating expenses                 0 0 0
Net premiums written                 0 0 0
Miscellaneous Income [Member]                      
Other income                 $ (9,438) $ (10,716) $ (8,881)
[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.