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Schedule III - Supplementary Insurance Information
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]  
Schedule III- Supplementary Insurance Information
($ in thousands)Deferred
policy
acquisition costs		Reserve
for loss
and loss expense		Unearned premiumsNet
premiums earned
Net
investment income1
Loss
and loss
expense incurred		Amortization
of deferred
policy
acquisition costs
Other
operating expenses2
Net
premiums written
Standard Commercial Lines Segment$246,494 3,596,340 1,196,243 2,143,184 — 1,245,627 474,322 271,504 2,230,636 
Standard Personal Lines Segment13,803 228,348 308,183 299,140 — 233,260 30,694 50,694 295,166 
E&S Lines Segment28,281 435,667 113,845 239,490 — 156,936 55,255 27,173 247,290 
Investments Segment— — — — 222,890 — — — — 
Total$288,578 4,260,355 1,618,271 2,681,814 222,890 1,635,823 560,271 349,371 2,773,092 
1Includes “Net investment income earned” and “Net realized and unrealized investment (losses) gains” on the Consolidated Statements of Income.
2“Other operating expenses” of $349,371 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses$366,941 
Other income(17,570)
Total$349,371 

See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.
 Year ended December 31, 2019
($ in thousands)Deferred
policy
acquisition costs		Reserve
for loss
and loss expense		Unearned premiumsNet
premiums earned
Net
investment income1
Loss
and loss
expense incurred		Amortization
of deferred
policy
acquisition costs
Other
operating expenses2
Net
premiums written
Standard Commercial Lines Segment$226,464 3,436,363 1,108,009 2,049,614 — 1,187,856 445,661 270,107 2,137,071 
Standard Personal Lines Segment16,848 224,200 309,125 307,739 — 211,300 34,477 53,702 304,592 
E&S Lines Segment27,874 406,600 106,033 239,818 — 152,335 55,835 21,905 237,761 
Investments Segment— — — — 236,965 — — — — 
Total$271,186 4,067,163 1,523,167 2,597,171 236,965 1,551,491 535,973 345,714 2,679,424 
1Includes “Net investment income earned” and “Net realized and unrealized investment (losses) gains” on the Consolidated Statements of Income.
2“Other operating expenses” of $345,714 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses$358,069 
Other income(12,355)
Total$345,714 

See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.

Year ended December 31, 2018
 
($ in thousands)Deferred
policy
acquisition costs		Reserve
for loss and loss expense		Unearned premiumsNet
premiums earned
Net
investment income1
Loss
and loss
expense incurred		Amortization
of deferred
policy
acquisition costs
Other
operating expenses2
Net
premiums written
Standard Commercial Lines Segment$206,391 3,283,531 1,020,054 1,912,222 — 1,141,038 412,420 249,660 1,975,683 
Standard Personal Lines Segment18,070 223,223 304,085 304,441 — 206,752 33,617 51,308 309,277 
E&S Lines Segment28,151 387,114 107,793 219,566 — 150,344 49,005 20,912 229,326 
Investments Segment— — — — 140,413 — — — — 
Total$252,612 3,893,868 1,431,932 2,436,229 140,413 1,498,134 495,042 321,880 2,514,286 
1Includes “Net investment income earned” and “Net realized and unrealized investment (losses) gains” on the Consolidated Statements of Income.
2“Other operating expenses” of $321,880 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses$331,318 
Other income(9,438)
Total$321,880 

See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.