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Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net premiums earned | $ 590,088 | $ 572,055 | $ 568,030 | $ 560,854 | $ 552,753 | $ 542,429 | $ 531,932 | $ 522,458 | $ 2,291,027 | $ 2,149,572 | $ 1,989,909
Net investment income earned | 42,587 | 40,446 | 41,430 | 37,419 | 35,428 | 33,375 | 31,182 | 30,769 | 161,882 | 130,754 | 121,316
Net realized (losses) gains | (1,128) | 6,798 | 1,734 | (1,045) | (7,686) | 3,688 | 1,765 | (2,704) | 11,204 | 3,562 | 31,537
Other income | 2,190 | 1,994 | 3,291 | 3,241 | 1,863 | 2,199 | 3,868 | 951 | 10,716 | 8,881 | 7,456
Total revenues | 633,737 | 621,293 | 614,485 | 600,469 | 582,358 | 581,691 | 568,747 | 551,474 | 2,469,984 | 2,284,270 | 2,131,852
Income before federal income tax | 68,150 | 67,315 | 58,929 | 67,574 | 50,326 | 55,443 | 62,311 | 51,875 | 261,968 | 219,955 | 232,692
Net income | $ 30,242 | $ 46,718 | $ 41,426 | $ 50,440 | $ 39,360 | $ 38,502 | $ 43,601 | $ 37,032 | $ 168,826 | $ 158,495 | $ 165,861
Basic net income per share | $ 0.52 | $ 0.80 | $ 0.71 | $ 0.87 | $ 0.68 | $ 0.66 | $ 0.75 | $ 0.64 | $ 2.89 | $ 2.74 | $ 2.90
Diluted net income per share | $ 0.51 | $ 0.79 | $ 0.70 | $ 0.85 | $ 0.67 | $ 0.66 | $ 0.74 | $ 0.63 | $ 2.84 | $ 2.70 | $ 2.85

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of property and casualty premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167274&loc=d3e27175-158546 + Details
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