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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenues |  |  |  |
Payment processing revenue | $ 314,149 | $ 236,824 | $ 580,461 | $ 476,539
Account servicing revenue | 106,892 | 78,716 | 193,978 | 157,420
Finance fee revenue | 62,912 | 51,553 | 109,285 | 100,434
Other revenue | 57,177 | 61,791 | 118,796 | 119,780
Total revenues | 441,807 | 370,798 | 823,683 | 724,826
Cost of services |  |  |  |
Service fees | 14,197 | 13,809 | 28,443 | 26,029
Provision for credit losses | 14,832 | 13,636 | 32,623 | 27,862
Operating interest | 10,693 | 9,528 | 20,257 | 18,013
Depreciation and amortization | 21,570 | 20,612 | 42,083 | 41,045
Total cost of services | 160,773 | 135,068 | 314,006 | 263,520
General and administrative | 76,247 | 47,589 | 140,652 | 103,022
Sales and marketing | 72,831 | 57,697 | 136,950 | 114,238
Depreciation and amortization | 37,219 | 30,020 | 68,403 | 59,763
Operating income | 94,737 | 100,424 | 163,672 | 184,283
Financing interest expense | (35,638) | (25,505) | (66,750) | (52,842)
Net foreign currency gain (loss) | 6,665 | (26,734) | 2,780 | (26,344)
Net unrealized (loss) gain on financial instruments | (21,516) | 2,706 | (33,428) | 16,214
Income before income taxes | 44,248 | 50,891 | 66,274 | 121,311
Income taxes | 12,397 | 12,325 | 18,215 | 30,074
Net income | 31,851 | 38,566 | 48,059 | 91,237
Less: Net income from non-controlling interests | 324 | 142 | 398 | 843
Net income attributable to WEX Inc. | 31,527 | 38,424 | 47,661 | 90,394
Accretion of non-controlling interest | (17,720) | 0 | (17,720) | 0
Net income attributable to shareholders | $ 13,807 | $ 38,424 | $ 29,941 | $ 90,394
Net income attributable to shareholders per share: |  |  |  |
Basic (in dollars per share) | $ 0.32 | $ 0.89 | $ 0.69 | $ 2.10
Diluted (in dollars per share) | $ 0.32 | $ 0.88 | $ 0.69 | $ 2.08
Weighted average common shares outstanding: |  |  |  |
Basic (in shares) | 43,329 | 43,181 | 43,277 | 43,116
Diluted (in shares) | 43,761 | 43,546 | 43,667 | 43,524
Payment processing revenue |  |  |  |
Revenues |  |  |  |
Payment processing revenue | $ 214,826 | $ 178,738 | $ 401,624 | $ 347,192
Cost of services |  |  |  |
Processing costs | $ 99,481 | $ 77,483 | $ 190,600 | $ 150,571

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