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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenues |  |  |  |  |
Software as a service and platform as a service |  | $ 113,469 | $ 102,265 | $ 212,916 | $ 214,001
License |  | 54,180 | 33,510 | 113,561 | 70,933
Maintenance |  | 56,009 | 60,332 | 110,480 | 117,663
Services |  | 16,941 | 23,823 | 35,104 | 43,399
Total revenues |  | 240,599 | 219,930 | 472,061 | 445,996
Operating expenses |  |  |  |  |
Cost of revenue | [1] | 120,357 | 115,384 | 228,900 | 233,818
Research and development |  | 34,969 | 46,421 | 72,254 | 90,025
Selling and marketing |  | 28,817 | 28,795 | 55,954 | 58,787
General and administrative |  | 72,527 | 34,520 | 105,030 | 60,588
Gain on sale of CFS assets |  | 0 | 0 | 0 | (151,952)
Depreciation and amortization |  | 22,372 | 21,382 | 44,743 | 44,590
Total operating expenses |  | 279,042 | 246,502 | 506,881 | 335,856
Operating income (loss) |  | (38,443) | (26,572) | (34,820) | 110,140
Other income (expense) |  |  |  |  |
Interest expense |  | (10,664) | (9,715) | (20,824) | (20,129)
Interest income |  | 150 | 121 | 256 | 271
Other |  | (1,766) | 2,023 | (1,117) | 1,689
Total other income (expense) |  | (12,280) | (7,571) | (21,685) | (18,169)
Income (loss) before income taxes |  | (50,723) | (34,143) | (56,505) | 91,971
Income tax expense (benefit) |  | (20,914) | (17,669) | (25,088) | 19,301
Net income (loss) |  | $ (29,809) | $ (16,474) | $ (31,417) | $ 72,670
Earnings (loss) per common share |  |  |  |  |
Basic |  | $ (0.25) | $ (0.14) | $ (0.27) | $ 0.62
Diluted |  | $ (0.25) | $ (0.14) | $ (0.27) | $ 0.61
Weighted average common shares outstanding |  |  |  |  |
Basic |  | 117,149 | 115,480 | 116,881 | 117,810
Diluted |  | 117,149 | 115,480 | 116,881 | 119,023
[1] | The cost of revenue excludes charges for depreciation but includes amortization of purchased and developed software for resale.

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