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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Revenues |  |  |  |
Insurance premiums and contract charges earned | $ 191,050 | $ 182,812 | $ 564,860 | $ 544,927
Net investment income | 94,847 | 81,016 | 270,685 | 248,324
Net realized investment gains | 3,985 | 1,308 | 6,911 | 8,789
Other income | 1,294 | 617 | 3,581 | 2,302
Total revenues | 291,176 | 265,753 | 846,037 | 804,342
Benefits, losses and expenses |  |  |  |
Benefits, claims and settlement expenses | 135,710 | 121,181 | 403,631 | 368,139
Interest credited | 48,658 | 46,216 | 142,924 | 136,103
Policy acquisition expenses amortized | 24,474 | 25,709 | 73,113 | 73,400
Operating expenses | 44,337 | 39,647 | 130,478 | 115,611
Interest expense | 2,975 | 2,652 | 8,858 | 9,610
Total benefits, losses and expenses | 256,154 | 235,405 | 759,004 | 702,863
Income before income taxes | 35,022 | 30,348 | 87,033 | 101,479
Income tax expense | 8,099 | 8,364 | 23,091 | 29,037
Net income | $ 26,923 | $ 21,984 | $ 63,942 | $ 72,442
Net income per share |  |  |  |
Basic | $ 0.66 | $ 0.53 | $ 1.55 | $ 1.73
Diluted | $ 0.65 | $ 0.52 | $ 1.55 | $ 1.71
Weighted average number of shares and equivalent shares (in thousands) |  |  |  |
Basic | 41,092 | 41,852 | 41,155 | 41,965
Diluted | 41,347 | 42,305 | 41,386 | 42,362
Net realized investment gains (losses) |  |  |  |
Total other-than-temporary impairment losses on securities | $ (160) | $ (3,602) | $ (7,686) | $ (20,860)
Portion of losses recognized in other comprehensive income | 0 | 0 | (290) | (4,300)
Net other-than-temporary impairment losses on securities recognized in earnings | (160) | (3,602) | (7,396) | (16,560)
Realized gains, net | 4,145 | 4,910 | 14,307 | 25,349
Total | $ 3,985 | $ 1,308 | $ 6,911 | $ 8,789

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- Definition The sum of insurance premiums earned, premiums earned on the income statement for all insurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers, plus contract charges earned on investment and universal life-type contracts. + References No definition available. + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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