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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenues |  |  |  |  |
Software as a service and platform as a service |  | $ 99,761 | $ 96,169 | $ 312,677 | $ 310,170
License |  | 50,017 | 43,256 | 163,578 | 114,189
Maintenance |  | 56,349 | 57,741 | 166,829 | 175,404
Services |  | 19,608 | 19,809 | 54,712 | 63,208
Total revenues |  | 225,735 | 216,975 | 697,796 | 662,971
Operating expenses |  |  |  |  |
Cost of revenue | [1] | 107,393 | 100,267 | 336,293 | 334,085
Research and development |  | 33,935 | 42,210 | 106,189 | 132,235
Selling and marketing |  | 25,236 | 29,874 | 81,190 | 88,661
General and administrative |  | 25,302 | 31,390 | 130,332 | 91,978
Gain on sale of CFS assets |  | 0 | 489 | 0 | (151,463)
Depreciation and amortization |  | 22,446 | 22,098 | 67,189 | 66,688
Total operating expenses |  | 214,312 | 226,328 | 721,193 | 562,184
Operating income (loss) |  | 11,423 | (9,353) | (23,397) | 100,787
Other income (expense) |  |  |  |  |
Interest expense |  | (9,374) | (9,838) | (30,198) | (29,967)
Interest income |  | 165 | 145 | 421 | 416
Other |  | (1,059) | 2,794 | (2,176) | 4,483
Total other income (expense) |  | (10,268) | (6,899) | (31,953) | (25,068)
Income (loss) before income taxes |  | 1,155 | (16,252) | (55,350) | 75,719
Income tax expense (benefit) |  | (2,233) | (6,426) | (27,321) | 12,875
Net income (loss) |  | $ 3,388 | $ (9,826) | $ (28,029) | $ 62,844
Earnings (loss) per common share |  |  |  |  |
Basic |  | $ 0.03 | $ (0.08) | $ (0.24) | $ 0.53
Diluted |  | $ 0.03 | $ (0.08) | $ (0.24) | $ 0.53
Weighted average common shares outstanding |  |  |  |  |
Basic |  | 118,254 | 116,118 | 117,096 | 117,606
Diluted |  | 119,743 | 116,118 | 117,096 | 118,971
[1] | The cost of revenue excludes charges for depreciation but includes amortization of purchased and developed software for resale.

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