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UNAUDITED 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: |  |  |  |
Service revenues | $ 612,352 | $ 594,225 | $ 1,783,506 | $ 1,709,018
Product revenues | 143,494 | 135,295 | 414,069 | 354,095
Total revenues | 755,846 | 729,520 | 2,197,575 | 2,063,113
Cost of revenues (exclusive of items shown separately below) |  |  |  |
Service revenues | 412,369 | 385,542 | 1,215,812 | 1,148,212
Product revenues | 107,226 | 106,373 | 320,171 | 287,984
Total cost of revenues | 519,595 | 491,915 | 1,535,983 | 1,436,196
Selling, general and administrative expenses | 113,252 | 110,954 | 337,767 | 322,501
Accretion of environmental liabilities | 2,347 | 2,476 | 7,053 | 7,529
Depreciation and amortization | 72,989 | 73,360 | 216,932 | 215,655
Goodwill impairment charge | 0 | 34,013 | 0 | 34,013
Income from operations | 47,663 | 16,802 | 99,840 | 47,219
Other expense | (432) | (198) | (2,814) | (737)
Loss on early extinguishment of debt | (1,846) | 0 | (7,891) | 0
(Loss) gain on sale of businesses | (77) | 16,431 | 31,645 | 16,431
Interest expense, net of interest income of $573, $196, $1,098 and $571, respectively | (20,675) | (21,565) | (65,743) | (62,192)
Income (loss) before (benefit) provision for income taxes | 24,633 | 11,470 | 55,037 | 721
Provision for income taxes | 12,575 | 21,725 | 38,492 | 27,881
Net income (loss) | $ 12,058 | $ (10,255) | $ 16,545 | $ (27,160)
Earnings (loss) per share: |  |  |  |
Basic (in USD per share) | $ 0.21 | $ (0.18) | $ 0.29 | $ (0.47)
Diluted (in USD per share) | $ 0.21 | $ (0.18) | $ 0.29 | $ (0.47)
Shares used to compute loss per share - Basic (in shares) | 57,033 | 57,487 | 57,149 | 57,575
Shares used to compute loss per share - Diluted (in shares) | 57,195 | 57,487 | 57,280 | 57,575

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total costs related to services rendered by an entity during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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