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Consolidated Statements of Operations - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |
Revenues | $ 1,246,929 | $ 1,200,211 | $ 1,196,696
Operating expenses | 918,673 | 890,212 | 868,144
Gross margin | 328,256 | 309,999 | 328,552
Selling, general and administrative expenses | 360,692 | 348,391 | 323,973
Restructuring and other related charges, net (see Note 17) | 6,727 | 2,651 | 5,513
(Gain) loss on revaluation of contingent consideration | (202) | (1,174) | 2,184
Goodwill impairment loss (see Note 1) | 0 | 75,241 | 0
Operating loss | (38,961) | (115,110) | (3,118)
Interest expense, net | 30,875 | 21,487 | 12,667
Write-off of deferred loan costs | 0 | 1,244 | 0
Loss (gain) on convertible debt embedded derivative (see Note 10) | 24,783 | (818) | 0
Other (income) expense, net | (410) | 510 | (127)
Loss from continuing operations before income taxes | (94,209) | (137,533) | (15,658)
Less: Benefit for income taxes (see Note 9) | (31,063) | (53,078) | (3,093)
Loss from continuing operations | (63,146) | (84,455) | (12,565)
Loss from discontinued operations, net of income tax | 0 | 0 | (111)
Net loss | $ (63,146) | $ (84,455) | $ (12,676)
Basic loss per common share: |  |  |
Basic earnings (loss) from continuing operations per share (in USD per share) | $ (2.10) | $ (2.83) | $ (0.45)
Basic earnings (loss) from discontinued operations per share (in USD per share) | 0.00 | 0.00 | 0.00
Net income (loss) per share: Basic (in USD per share) | (2.10) | (2.83) | (0.45)
Diluted loss per common share: |  |  |
Diluted earnings (loss) from continuing operations per share (in USD per share) | (2.10) | (2.83) | (0.45)
Diluted earnings (loss) from discontinued operations per share (in USD per share) | 0.00 | 0.00 | 0.00
Net income (loss) per share: Diluted (in USD per share) | $ (2.10) | $ (2.83) | $ (0.45)

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