Consolidated Statements Of Earnings - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues:    
Earned premium $ 353,987 $ 341,368
Percent change, Earned premium 3.70%  
Installment and other fee income $ 27,395 26,739
Percent change, Installment and other fee income 2.50%  
Net investment income $ 9,786 8,695
Percent change, Net investment Income 12.50%  
Total net realized (losses) gains on investments $ (2,832) 509
Percent change, Net realized gains on investments (656.20%)  
Other income $ 430 275
Percent change, Other income 56.30%  
Total revenues $ 388,766 377,587
Percent change, Total revenues 3.00%  
Costs and Expenses:    
Losses and loss adjustment expenses $ 264,552 270,676
Percent change, Losses and loss adjustment expenses (2.30%)  
Commissions and other underwriting expenses $ 90,521 85,939
Percent change, Commissions and other underwriting expenses 5.30%  
Interest expense $ 3,509 3,512
Percent change, Interest expense (0.10%)  
Corporate general and administrative expenses $ 4,743 2,271
Percent change, Corporate general and administrative expenses 108.90%  
Other expenses $ 505 322
Percent change, Other expenses 56.90%  
Total costs and expenses $ 363,829 362,719
Percent change, Total costs and expenses 0.30%  
Earnings before income taxes $ 24,937 14,868
Percent change, Earnings before income taxes 67.70%  
Provision for income taxes $ 4,853 4,358
Percent change, Provision for income taxes 11.40%  
Net Earnings $ 20,083 $ 10,510
Percent change, Net Earnings 91.10%  
Net Earnings per Common Share:    
Basic (usd per share) $ 1.84 $ 0.96
Percent change, Basic 91.70%  
Diluted (usd per share) $ 1.82 $ 0.94
Percent change, Diluted 93.60%  
Average Number of Common Shares:    
Basic (shares) 10,915 10,998
Percent change, Basic (0.80%)  
Diluted (shares) 11,009 11,127
Percent change, Diluted (1.10%)  
Cash Dividends per Common Share (usd per share) $ 0.58 $ 0.58
Percent change, Cash Dividends per Common Share 0.00%  
Net realized gains on sales $ 1,363 $ 519
Trading Securities, Change in Unrealized Holding Gain (Loss) (2,607) 0
Total other-than-temporary impairment (OTTI) losses (1,468) (46)
Non-credit portion in other comprehensive income $ 158 36
Non-credit portion in other comprehensive income, percent 341.90%  
OTTI losses reclassified from other comprehensive income $ (278) 0
Net impairment losses recognized in earnings 1,588 10
Total net realized (losses) gains on investments $ (2,832) $ 509
Percent change, Total net realized gains on investments (656.20%)