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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenues |  |  |  |
Insurance premiums and contract charges earned | $ 195,718 | $ 188,360 | $ 391,440 | $ 373,810
Net investment income | 91,994 | 91,179 | 182,705 | 175,838
Net realized investment gains | 2,072 | 3,080 | 1,830 | 2,926
Other income | 1,652 | 939 | 2,765 | 2,287
Total revenues | 291,436 | 283,558 | 578,740 | 554,861
Benefits, losses and expenses |  |  |  |
Benefits, claims and settlement expenses | 165,879 | 148,408 | 309,975 | 267,921
Interest credited | 49,348 | 47,576 | 98,122 | 94,266
Policy acquisition expenses amortized | 24,808 | 24,587 | 49,694 | 48,639
Operating expenses | 46,228 | 43,345 | 94,984 | 86,141
Interest expense | 2,945 | 2,948 | 5,901 | 5,883
Total benefits, losses and expenses | 289,208 | 266,864 | 558,676 | 502,850
Income before income taxes | 2,228 | 16,694 | 20,064 | 52,011
Income tax (benefit) expense | (33) | 4,828 | 2,485 | 14,992
Net income | $ 2,261 | $ 11,866 | $ 17,579 | $ 37,019
Net income per share |  |  |  |
Basic (in usd per share) | $ 0.05 | $ 0.29 | $ 0.43 | $ 0.90
Diluted (in usd per share) | $ 0.05 | $ 0.29 | $ 0.42 | $ 0.89
Weighted average number of shares and equivalent shares (in thousands) |  |  |  |
Basic (in shares) | 41,368 | 41,082 | 41,268 | 41,200
Diluted (in shares) | 41,493 | 41,314 | 41,416 | 41,416
Net realized investment gains (losses) |  |  |  |
Total other-than-temporary impairment losses on securities | $ (3,564) | $ (3,853) | $ (6,361) | $ (7,526)
Portion of losses recognized in other comprehensive income | 0 | (290) | 0 | (290)
Net other-than-temporary impairment losses on securities recognized in earnings | (3,564) | (3,563) | (6,361) | (7,236)
Realized investment gains, net | 5,636 | 6,643 | 8,191 | 10,162
Total | $ 2,072 | $ 3,080 | $ 1,830 | $ 2,926

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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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