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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
PREMIUMS EARNED AND OTHER REVENUES      
Direct premiums written $ 1,055,886 $ 954,617 $ 883,409
Change in unearned premium (56,688) (33,390) (46,617)
Direct premium earned 999,198 921,227 836,792
Ceded premium earned (310,405) (288,811) (332,793)
Premiums earned, net 688,793 632,416 503,999
Net investment income (expense) 13,460 9,540 5,155
Net realized gains (losses) on investments 2,570 2,294 1,060
Commission revenue 21,253 17,733 14,870
Policy fees 18,838 16,880 15,440
Other revenue 7,002 6,426 6,020
Total premiums earned and other revenues 751,916 685,289 546,544
OPERATING COSTS AND EXPENSES      
Losses and loss adjustment expenses 350,428 301,229 187,739
General and administrative expenses 231,004 221,177 183,782
Total operating costs and expenses 581,432 522,406 371,521
INCOME BEFORE INCOME TAXES 170,484 162,883 175,023
Income tax expense 63,549 63,473 68,539
NET INCOME $ 106,935 $ 99,410 $ 106,484
Basic earnings per common share $ 3.07 $ 2.85 $ 3.06
Weighted average common shares outstanding - Basic 34,841 34,919 34,799
Diluted earnings per common share $ 2.99 $ 2.79 $ 2.97
Weighted average common shares outstanding - Diluted 35,809 35,650 35,884
Cash dividend declared per common share $ 0.69 $ 0.69 $ 0.63