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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Revenues |  |  |  |  |
License |  | $ 50,237 | $ 57,653 | $ 156,975 | $ 154,732
Maintenance |  | 59,262 | 63,764 | 178,895 | 188,572
Services |  | 25,842 | 28,194 | 72,449 | 75,773
Hosting |  | 103,360 | 100,033 | 329,021 | 306,848
Total revenues |  | 238,701 | 249,644 | 737,340 | 725,925
Operating expenses |  |  |  |  |
Cost of license | [1] | 5,387 | 5,433 | 17,435 | 18,066
Cost of maintenance, services and hosting | [1] | 104,272 | 105,319 | 337,769 | 325,801
Research and development |  | 36,123 | 36,321 | 112,639 | 112,653
Selling and marketing |  | 28,451 | 27,078 | 88,660 | 82,994
General and administrative |  | 20,284 | 25,329 | 66,867 | 75,127
Depreciation and amortization |  | 20,298 | 18,295 | 59,995 | 52,383
Total operating expenses |  | 214,815 | 217,775 | 683,365 | 667,024
Operating income |  | 23,886 | 31,869 | 53,975 | 58,901
Other income (expense) |  |  |  |  |
Interest expense |  | (9,728) | (10,416) | (31,174) | (28,920)
Interest income |  | 94 | 98 | 254 | 432
Other, net |  | 4,314 | 3,614 | 27,695 | (1,344)
Total other income (expense) |  | (5,320) | (6,704) | (3,225) | (29,832)
Income before income taxes |  | 18,566 | 25,165 | 50,750 | 29,069
Income tax expense |  | 3,786 | 9,433 | 9,081 | 7,875
Net income |  | $ 14,780 | $ 15,732 | $ 41,669 | $ 21,194
Income per common share |  |  |  |  |
Basic |  | $ 0.13 | $ 0.14 | $ 0.36 | $ 0.18
Diluted |  | $ 0.12 | $ 0.14 | $ 0.35 | $ 0.18
Weighted average common shares outstanding |  |  |  |  |
Basic |  | 117,922 | 114,484 | 117,035 | 114,603
Diluted |  | 119,304 | 116,428 | 118,498 | 116,682
[1] | The cost of software license fees excludes charges for depreciation but includes amortization of purchased and developed software for resale. The cost of maintenance, services and hosting fees excludes charges for depreciation.

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