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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred policy acquisition costs $ 222,564 $ 213,159 $ 185,608
Reserve for loss and loss expenses 3,691,719 3,517,728 3,477,870
Unearned premiums 1,262,819 1,169,710 1,095,819
Net premiums earned 2,149,572 1,989,909 1,852,609
Net investment income 125,817 134,487 165,307
Losses and loss expenses incurred 1,234,797 1,148,541 1,157,501
Amortization of deferred policy acquisition costs 450,328 399,435 364,295
Other operating expenses 312,515 292,904 252,670
Net premiums written 2,237,288 2,069,904 1,885,280
Policy acquisition costs 763,758 689,820 624,470
Other income (8,881) (7,456) (16,945)
Other expenses 42,989 38,371 32,696
Total 762,843 692,339 616,965
Standard Commercial Lines [Member]      
Deferred policy acquisition costs 181,193 171,476 147,285
Reserve for loss and loss expenses 3,098,554 2,998,749 3,000,796
Unearned premiums 884,976 803,648 734,697
Net premiums earned 1,665,483 1,529,442 1,415,712
Net investment income 0 0 0
Losses and loss expenses incurred 913,506 819,573 870,018
Amortization of deferred policy acquisition costs 367,813 323,753 295,774
Other operating expenses 237,730 221,620 188,699
Net premiums written 1,745,782 1,596,965 1,441,047
Standard Personal Lines [Member]      
Deferred policy acquisition costs 16,664 17,258 17,495
Reserve for loss and loss expenses 286,081 265,054 279,761
Unearned premiums 282,111 276,533 285,777
Net premiums earned 280,607 288,134 296,747
Net investment income 0 0 0
Losses and loss expenses incurred 177,749 200,237 197,182
Amortization of deferred policy acquisition costs 34,105 33,638 34,851
Other operating expenses 56,334 52,923 48,178
Net premiums written 281,822 283,926 292,061
Excess And Surplus Operations [Member]      
Deferred policy acquisition costs 24,707 24,425 20,828
Reserve for loss and loss expenses 307,084 253,925 197,313
Unearned premiums 95,732 89,529 75,345
Net premiums earned 203,482 172,333 140,150
Net investment income 0 0 0
Losses and loss expenses incurred 143,542 128,731 90,301
Amortization of deferred policy acquisition costs 48,410 42,044 33,670
Other operating expenses 18,451 18,361 15,793
Net premiums written 209,684 189,013 152,172
Investments Segment [Member]      
Deferred policy acquisition costs 0 0 0
Reserve for loss and loss expenses 0 0 0
Unearned premiums 0 0 0
Net premiums earned 0 0 0
Net investment income 125,817 134,487 165,307
Losses and loss expenses 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 (8,881) (7,456) (16,598)
Other Income [Member]      
Other income 0 0 (347)
Miscellaneous Expense [Member]      
Other expenses 7,966 9,975 9,093
Other Expense [Member]      
Other expenses $ 35,023 $ 28,396 $ 23,603