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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenues |  |
Net premiums earned | $ 1,167,402 | $ 938,703
Net investment income | 100,999 | 98,664
Other insurance related income (losses) | 6,606 | (3,783)
Net investment losses: |  |
Other-than-temporary impairment (OTTI) losses | (414) | (6,553)
Other realized and unrealized investment losses | (14,416) | (18,497)
Total net investment losses | (14,830) | (25,050)
Total revenues | 1,260,177 | 1,008,534
Expenses |  |
Net losses and loss expenses | 661,345 | 606,942
Acquisition costs | 229,260 | 189,792
General and administrative expenses | 169,837 | 161,260
Foreign exchange losses | 37,860 | 21,465
Interest expense and financing costs | 16,763 | 12,791
Reorganization expenses | 13,054 | 0
Amortization of value of business acquired | 57,110 | 0
Amortization of intangibles | 2,782 | 0
Total expenses | 1,188,011 | 992,250
Income before income taxes and interest in income (loss) of equity method investments | 72,166 | 16,284
Income tax benefit | 1,036 | 9,337
Interest in loss of equity method investments | 0 | (5,766)
Net income | 73,202 | 19,855
Preferred share dividends | 10,656 | 14,841
Net income available to common shareholders | $ 62,546 | $ 5,014
Net income per common share: |  |
Basic net income (in usd per share) | $ 0.75 | $ 0.06
Diluted net income (in usd per share) | $ 0.75 | $ 0.06
Weighted average number of common shares outstanding - basic (in shares) | 83,322 | 86,022
Weighted average number of common shares outstanding - diluted (in shares) | 83,721 | 86,793
Cash dividends declared per common share (in usd per share) | $ 0.39 | $ 0.38

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: 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 + 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=96947427&loc=d3e1448-109256 + Details
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