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Consolidated Statements of Income - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenues: |  |  |  |
Net premiums earned | $ 653,620 | $ 614,277 | $ 1,928,812 | $ 1,810,941
Net investment income earned | 55,826 | 52,443 | 164,949 | 141,227
Net realized and unrealized (losses) gains: |  |  |  |
Net realized investment gains (losses) on disposals | 20,425 | (751) | 26,752 | 4,034
Unrealized losses on equity securities | (20,317) | (2,610) | (8,091) | (15,563)
Other-than-temporary impairments | (2,291) | (1,426) | (3,366) | (5,459)
Total net realized and unrealized (losses) gains | (2,183) | (4,787) | 15,295 | (16,988)
Other income | 3,162 | 2,538 | 8,535 | 7,896
Total revenues | 710,425 | 664,471 | 2,117,591 | 1,943,076
Expenses: |  |  |  |
Loss and loss expense incurred | 398,675 | 379,199 | 1,166,238 | 1,130,468
Amortization of deferred policy acquisition costs | 136,572 | 124,511 | 399,647 | 368,265
Other insurance expenses | 90,234 | 80,108 | 261,975 | 244,342
Interest expense | 7,397 | 6,073 | 26,289 | 18,350
Corporate expenses | 6,369 | 7,450 | 28,345 | 22,065
Total expenses | 639,247 | 597,341 | 1,882,494 | 1,783,490
Income before federal income tax | 71,178 | 67,130 | 235,097 | 159,586
Federal income tax expense: |  |  |  |
Current | 13,805 | 10,314 | 44,344 | 23,529
Deferred | 1,223 | 1,381 | 989 | 2,878
Total federal income tax expense | 15,028 | 11,695 | 45,333 | 26,407
Net income | $ 56,150 | $ 55,435 | $ 189,764 | $ 133,179
Earnings per share: |  |  |  |
Basic net income | $ 0.94 | $ 0.94 | $ 3.20 | $ 2.26
Diluted net income | $ 0.93 | $ 0.93 | $ 3.16 | $ 2.23

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