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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Premiums written: |  |  |
Direct | $ 1,106,632 | $ 1,124,196 | $ 1,103,332
Assumed | 10,837 | 6,446 | 271
Ceded | (188,727) | (129,334) | (111,341)
Net premiums written | 928,742 | 1,001,308 | 992,262
Decrease (increase) in unearned premiums | 93,201 | 29,680 | (17,100)
Net premiums earned | 1,021,943 | 1,030,988 | 975,162
Investment income, net of expenses | 154,396 | 167,045 | 141,331
Net realized investment gains (losses) | 13,752 | 5,306 | (1,353)
Other revenue | 9,055 | 10,638 | 8,708
Total revenues | 1,199,146 | 1,213,977 | 1,123,848
Losses and expenses: |  |  |
Losses incurred, net | 364,774 | 118,575 | 36,562
Amortization of deferred policy acquisition costs | 12,380 | 12,001 | 11,932
Other underwriting and operating expenses, net | 176,398 | 182,768 | 178,211
Loss on debt extinguishment | 26,736 | 0 | 0
Interest expense | 59,595 | 52,656 | 52,993
Total losses and expenses | 639,883 | 366,000 | 279,698
Income before tax | 559,263 | 847,977 | 844,150
Provision for income taxes | 113,170 | 174,214 | 174,053
Net income | $ 446,093 | $ 673,763 | $ 670,097
Earnings per share: |  |  |
Basic (in dollars per share) | $ 1.31 | $ 1.91 | $ 1.83
Diluted (in dollars per share) | $ 1.29 | $ 1.85 | $ 1.78
Weighted average common shares outstanding - basic (in shares) | 339,953 | 352,827 | 365,406
Weighted average common shares outstanding - diluted (in shares) | 359,293 | 373,924 | 386,078

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