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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues: |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | $ 2,398,650 | $ 2,280,809 | $ 2,744,272
Product revenues |  |  |  |  |  |  |  |  | 546,328 | 474,417 | 530,865
Total revenues | $ 747,403 | $ 755,846 | $ 752,788 | $ 688,941 | $ 692,113 | $ 729,520 | $ 697,510 | $ 636,083 | 2,944,978 | 2,755,226 | 3,275,137
Cost of revenues: (exclusive of items shown separately below) |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 1,641,798 | 1,543,210 | 1,898,907
Product revenues |  |  |  |  |  |  |  |  | 420,875 | 389,647 | 457,899
Total cost of revenues | 526,690 | 519,595 | 519,803 | 496,585 | 496,661 | 491,915 | 480,002 | 464,279 | 2,062,673 | 1,932,857 | 2,356,806
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 456,648 | 422,015 | 414,164
Accretion of environmental liabilities |  |  |  |  |  |  |  |  | 9,460 | 10,177 | 10,402
Depreciation and amortization |  |  |  |  |  |  |  |  | 288,422 | 287,002 | 274,194
Goodwill impairment charges |  |  |  |  |  | 34,000 |  |  | 0 | 34,013 | 31,992
Income (loss) from operations | 27,935 | 47,663 | 46,744 | 5,433 | 21,943 | 16,802 | 34,504 | (4,087) | 127,775 | 69,162 | 187,579
Other (expense) income, net | (3,305) | (432) | (833) | (1,549) | 6,932 | (198) | (189) | (350) | (6,119) | 6,195 | (1,380)
Loss on early extinguishment of debt |  | (1,900) | (6,000) |  |  |  |  |  | (7,891) | 0 | 0
Gain on sale of businesses |  |  | 31,700 |  |  | 16,400 |  |  | 30,732 | 16,884 | 0
Interest expense, net of interest income of $1,897, $784, and $626, respectively |  |  |  |  |  |  |  |  | (85,808) | (83,525) | (76,553)
Income (loss) before (benefit) provision for income taxes |  |  |  |  |  |  |  |  | 58,689 | 8,716 | 109,646
(Benefit) provision for income taxes |  |  |  |  |  |  |  |  | (42,050) | 48,589 | 65,544
Net income (loss) | $ 84,194 | $ 12,058 | $ 25,880 | $ (21,393) | $ (12,713) | $ (10,255) | $ 3,966 | $ (20,871) | $ 100,739 | $ (39,873) | $ 44,102
Earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.48 | $ 0.21 | $ 0.45 | $ (0.37) | $ (0.22) | $ (0.18) | $ 0.07 | $ (0.36) | $ 1.77 | $ (0.69) | $ 0.76
Diluted (in dollars per share) | $ 1.48 | $ 0.21 | $ 0.45 | $ (0.37) | $ (0.22) | $ (0.18) | $ 0.07 | $ (0.36) | $ 1.76 | $ (0.69) | $ 0.76
Shares used to compute earnings (loss) per share — Basic (in shares) |  |  |  |  |  |  |  |  | 57,072 | 57,532 | 58,324
Shares used to compute earnings (loss) per share — Diluted (in shares) |  |  |  |  |  |  |  |  | 57,200 | 57,532 | 58,434

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