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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest income: |  |  |
Loans | $ 1,894,687 | $ 1,413,505 | $ 1,060,487
Investments | 6,162 | 8,288 | 9,160
Cash and cash equivalents | 34,503 | 15,510 | 7,599
Total interest income | 1,935,352 | 1,437,303 | 1,077,246
Interest expense: |  |  |
Deposits | 389,349 | 223,691 | 148,408
Interest expense on short-term borrowings | 5,833 | 6,341 | 7,322
Interest expense on long-term borrowings | 127,106 | 78,050 | 30,178
Total interest expense | 522,288 | 308,082 | 185,908
Net interest income | 1,413,064 | 1,129,221 | 891,338
Less: provisions for credit losses | 244,864 | 185,765 | 159,405
Net interest income after provisions for credit losses | 1,168,200 | 943,456 | 731,933
Non-interest (loss) income: |  |  |
Gains on sales of loans, net | 2,060 | 0 | 230
Losses on sales of securities, net | (1,549) | 0 | 0
Losses on derivatives and hedging activities, net | (87) | (8,266) | (958)
Other (loss) income | (52,319) | 5,364 | 69,544
Total non-interest (loss) income | (51,895) | (2,902) | 68,816
Non-interest expenses: |  |  |
Compensation and benefits | 252,346 | 213,319 | 183,996
FDIC assessment fees | 32,786 | 28,950 | 19,209
Other operating expenses | 271,844 | 206,820 | 183,108
Total non-interest expenses | 556,976 | 449,089 | 386,313
Income before income tax expense | 559,329 | 491,465 | 414,436
Income tax expense | 71,853 | 202,531 | 164,109
Net income | 487,476 | 288,934 | 250,327
Preferred stock dividends | 15,640 | 15,714 | 21,204
Net income attributable to SLM Corporation common stock | $ 471,836 | $ 273,220 | $ 229,123
Basic earnings per common share attributable to SLM Corporation | $ 1.08 | $ 0.63 | $ 0.54
Average common shares outstanding | 435,054 | 431,216 | 427,876
Diluted earnings per common share attributable to SLM Corporation | $ 1.07 | $ 0.62 | $ 0.53
Average common and common equivalent shares outstanding | 439,681 | 438,551 | 432,919

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