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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Premiums written: |  |  |
Direct | $ 1,121,776 | $ 1,107,923 | $ 1,074,490
Assumed | 1,905 | 1,053 | 1,178
Ceded | (125,726) | (133,885) | (55,391)
Net premiums written | 997,955 | 975,091 | 1,020,277
Increase in unearned premiums | (63,208) | (49,865) | (124,055)
Net premiums earned | 934,747 | 925,226 | 896,222
Investment income, net of expenses | 120,871 | 110,666 | 103,741
Net realized investment gains | 249 | 8,932 | 28,361
Other revenue | 10,187 | 17,659 | 12,964
Total revenues | 1,066,054 | 1,062,483 | 1,041,288
Losses and expenses: |  |  |
Losses incurred, net | 53,709 | 240,157 | 343,547
Change in premium deficiency reserve | 0 | 0 | (23,751)
Amortization of deferred policy acquisition costs | 11,111 | 9,646 | 8,789
Other underwriting and operating expenses, net | 159,638 | 150,763 | 155,577
Interest expense | 57,035 | 56,672 | 68,932
Loss on debt extinguishment | 65 | 90,531 | 507
Total losses and expenses | 281,558 | 547,769 | 553,601
Income before tax | 784,496 | 514,714 | 487,687
Provision for (benefit from) income taxes | 428,735 | 172,197 | (684,313)
Net income | $ 355,761 | $ 342,517 | $ 1,172,000
Earnings per share: |  |  |
Basic (in dollars per share) | $ 0.98 | $ 1.00 | $ 3.45
Diluted (in dollars per share) | $ 0.95 | $ 0.86 | $ 2.60
Weighted average common shares outstanding - basic (in shares) | 362,380 | 342,890 | 339,552
Weighted average common shares outstanding - diluted (in shares) | 394,766 | 431,992 | 468,039
Dividends per share (in dollars per share) | $ 0 | $ 0 | $ 0

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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 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)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + 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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Period Type: | duration