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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Interest income: |  |  |
Loans | $ 817,120 | $ 660,792 | $ 527,257
Investments | 10,247 | 8,913 | 20,090
Cash and cash equivalents | 3,751 | 4,589 | 3,853
Total interest income | 831,118 | 674,294 | 551,200
Interest expense: |  |  |
Deposits | 116,386 | 95,774 | 88,019
Interest expense on short-term borrowings | 6,490 | 0 | 0
Interest expense on long-term borrowings | 5,738 | 0 | 0
Other interest expense | 5 | 41 | 1,066
Total interest expense | 128,619 | 95,815 | 89,085
Net interest income | 702,499 | 578,479 | 462,115
Less: provisions for credit losses | 90,055 | 85,529 | 69,339
Net interest income after provisions for credit losses | 612,444 | 492,950 | 392,776
Non-interest income: |  |  |
Gains on sales of loans, net | 135,358 | 121,359 | 196,593
Gains on sales of securities | 0 | 0 | 63,813
Gains (losses) on derivatives and hedging activities, net | 5,300 | (3,996) | 640
Other | 41,935 | 39,921 | 37,222
Total non-interest income | 182,593 | 157,284 | 298,268
Expenses: |  |  |
Compensation and benefits | 158,975 | 129,709 | 106,799
Other operating expenses | 190,120 | 145,172 | 163,675
Total operating expenses | 349,095 | 274,881 | 270,474
Acquired intangible asset impairment and amortization expense | 1,480 | 3,290 | 3,317
Restructuring and other reorganization expenses | 5,398 | 38,311 | 726
Total expenses | 355,973 | 316,482 | 274,517
Income before income tax expense | 439,064 | 333,752 | 416,527
Income tax expense | 164,780 | 139,967 | 158,934
Net income | 274,284 | 193,785 | 257,593
Less: net loss attributable to noncontrolling interest | 0 | (434) | (1,352)
Net income attributable to SLM Corporation | 274,284 | 194,219 | 258,945
Preferred stock dividends | 19,595 | 12,933 | 0
Net income attributable to SLM Corporation common stock | $ 254,689 | $ 181,286 | $ 258,945
Basic earnings per common share attributable to SLM Corporation (in dollars per share) | $ 0.60 | $ 0.43 | $ 0.59
Average common shares outstanding (in shares) | 425,574 | 423,970 | 440,108
Diluted earnings per common share attributable to SLM Corporation (in dollars per share) | $ 0.59 | $ 0.42 | $ 0.58
Average common and common equivalent shares outstanding (in shares) | 432,234 | 432,269 | 448,549

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