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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred policy acquisition costs $ 213,159 $ 185,608 $ 172,981
Reserve for loss and loss expenses 3,517,728 3,477,870 3,349,770
Unearned premiums 1,169,710 1,095,819 1,059,155
Net premiums earned 1,989,909 1,852,609 1,736,072
Net investment income 134,487 165,307 155,375
Losses and loss expenses incurred 1,148,541 1,157,501 1,121,738
Amortization of deferred policy acquisition costs 399,435 364,295 331,828
Other operating expenses 292,904 252,670 243,740
Net premiums written 2,069,904 1,885,280 1,810,159
Policy acquisition costs 689,820 624,470 579,977
Other income (7,456) (16,945) (12,294)
Other expenses 38,371 32,696 31,863
Total 692,339 616,965 575,568
Standard Commercial Lines [Member]      
Deferred policy acquisition costs 171,476 147,285 138,397
Reserve for loss and loss expenses 2,998,749 3,000,796 2,877,087
Unearned premiums 803,648 734,697 708,861
Net premiums earned 1,529,442 1,415,712 1,316,619
Net investment income 0 0 0
Losses and loss expenses incurred 819,573 870,018 831,261
Amortization of deferred policy acquisition costs 323,753 295,774 270,443
Other operating expenses 221,620 188,699 181,059
Net premiums written 1,596,965 1,441,047 1,380,740
Standard Personal Lines [Member]      
Deferred policy acquisition costs 17,258 17,495 18,149
Reserve for loss and loss expenses 265,054 279,761 312,411
Unearned premiums 276,533 285,777 286,969
Net premiums earned 288,134 296,747 294,332
Net investment income 0 0 0
Losses and loss expenses incurred 200,237 197,182 206,450
Amortization of deferred policy acquisition costs 33,638 34,851 33,097
Other operating expenses 52,923 48,178 46,140
Net premiums written 283,926 292,061 297,757
Excess And Surplus Operations [Member]      
Deferred policy acquisition costs 24,425 20,828 16,435
Reserve for loss and loss expenses 253,925 197,313 160,272
Unearned premiums 89,529 75,345 63,325
Net premiums earned 172,333 140,150 125,121
Net investment income 0 0 0
Losses and loss expenses incurred 128,731 90,301 84,027
Amortization of deferred policy acquisition costs 42,044 33,670 28,288
Other operating expenses 18,361 15,793 16,541
Net premiums written 189,013 152,172 131,662
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 134,487 165,307 155,375
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 (7,456) (16,598) (12,201)
Other Income [Member]      
Other income 0 (347) (93)
Miscellaneous Expense [Member]      
Other expenses 9,975 9,093 7,792
Other Expense [Member]      
Other expenses $ 28,396 $ 23,603 $ 24,071