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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues:        
Direct premiums $ 667,191 $ 637,426 $ 1,323,278 $ 1,265,124
Ceded premiums (403,449) (406,043) (797,698) (805,811)
Net premiums 263,742 231,383 525,580 459,313
Investment income net of investment expenses 29,082 25,829 56,472 51,442
Interest expense on surplus note (9,052) (6,087) (17,425) (11,806)
Net investment income 20,030 19,742 39,047 39,636
Realized investment gains (losses), including other-than- temporary impairment losses 1,313 104 (344) 238
Other, net 14,790 14,150 28,687 27,089
Total revenues 467,815 413,696 927,737 818,860
Benefits and expenses:        
Benefits and claims 105,069 99,512 221,960 201,897
Amortization of deferred policy acquisition costs 53,847 47,861 114,011 99,710
Sales commissions 82,954 75,440 165,473 149,144
Insurance expenses 43,451 36,920 84,560 74,541
Insurance commissions 6,417 5,157 12,294 10,057
Interest expense 7,229 7,143 14,401 14,270
Other operating expenses 55,083 45,274 118,311 98,011
Total benefits and expenses 354,050 317,307 731,010 647,630
Income before income taxes 113,765 96,389 196,727 171,230
Income taxes 27,065 33,282 44,313 56,054
Net income $ 86,700 $ 63,107 $ 152,414 $ 115,176
Earnings per share:        
Basic earnings per share $ 1.96 $ 1.36 $ 3.41 $ 2.48
Diluted earnings per share $ 1.95 $ 1.36 $ 3.40 $ 2.47
Weighted-average shares used in computing earnings per share:        
Basic 44,066 45,984 44,401 46,142
Diluted 44,207 46,071 44,529 46,222
Supplemental disclosures:        
Total impairment losses $ (54) $ (484) $ (103) $ (695)
Net impairment losses recognized in earnings (54) (484) (103) (695)
Other net realized investment gains 828 588 1,165 933
Net gains (losses) recognized on equity securities 539   (1,406)  
Net realized investment gains (losses), including other-than- temporary impairment losses $ 1,313 $ 104 $ (344) $ 238
Dividends declared per share $ 0.25 $ 0.19 $ 0.50 $ 0.38
Commissions and Fees [Member]        
Revenues:        
Commissions and fees $ 167,940 $ 148,317 $ 334,767 $ 292,584