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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenues |  |  |  |
Payment processing revenue | $ 244,872 |  | $ 721,411 |
Account servicing revenue | 78,748 | $ 71,322 | 236,168 | $ 198,538
Finance fee revenue | 53,703 | 50,879 | 154,958 | 136,336
Other revenue | 67,368 | 56,099 | 187,206 | 160,935
Total revenues | 382,690 | 324,002 | 1,108,395 | 919,243
Cost of services |  |  |  |
Service fees | 13,818 | 19,658 | 39,847 | 57,413
Provision for credit losses | 21,435 | 19,614 | 46,930 | 47,927
Operating interest | 10,268 | 7,537 | 28,281 | 17,049
Depreciation and amortization | 19,013 | 18,879 | 60,058 | 54,639
Total cost of services | 144,114 | 134,807 | 410,624 | 379,710
General and administrative | 51,799 | 51,538 | 155,720 | 133,788
Sales and marketing | 54,611 | 41,585 | 168,849 | 121,726
Depreciation and amortization | 29,054 | 32,349 | 88,817 | 95,788
Impairment charges | 2,424 | 0 | 2,424 | 16,175
Operating income | 100,688 | 63,723 | 281,961 | 172,056
Financing interest expense | (25,718) | (25,754) | (78,560) | (81,449)
Net foreign currency (loss) gain | (1,094) | 14,611 | (27,438) | 33,578
Net unrealized gain (loss) on financial instruments | 2,157 | (150) | 18,371 | (849)
Income before income taxes | 76,033 | 52,430 | 194,334 | 123,336
Income taxes | 18,751 | 18,570 | 48,278 | 43,760
Net income | 57,282 | 33,860 | 146,056 | 79,576
Less: Net (loss) income from non-controlling interest | (40) | (111) | 803 | (886)
Net income attributable to shareholders | $ 57,322 | $ 33,971 | $ 145,253 | $ 80,462
Net income attributable to WEX Inc. per share: |  |  |  |
Basic (in dollars per share) | $ 1.33 | $ 0.79 | $ 3.37 | $ 1.87
Diluted (in dollars per share) | $ 1.31 | $ 0.79 | $ 3.33 | $ 1.87
Weighted average common shares outstanding: |  |  |  |
Basic (in shares) | 43,191 | 43,014 | 43,141 | 42,963
Diluted (in shares) | 43,615 | 43,101 | 43,558 | 43,092
Payment processing revenue |  |  |  |
Revenues |  |  |  |
Payment processing revenue | $ 182,871 | $ 145,702 | $ 530,063 | $ 423,434
Cost of services |  |  |  |
Processing costs | $ 79,580 | $ 69,119 | $ 235,508 | $ 202,682

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