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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Summary of Selected Unaudited Quarterly Financial Data | The following is a summary of selected unaudited quarterly financial data for the years ended December 31, 2018 and 2017 (in thousands, except per share data):
| Year Ended December 31, 2018
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total Year
Revenues | $ | 302,385 |  |  | $ | 343,889 |  |  | $ | 290,856 |  |  | $ | 309,799 |  |  | $ | 1,246,929 |
Gross margin | $ | 75,534 |  |  | $ | 97,182 |  |  | $ | 70,139 |  |  | $ | 85,401 |  |  | $ | 328,256 |
Operating income (loss) | $ | (14,125 | ) |  | $ | 1,799 |  |  | $ | (19,694 | ) |  | $ | (6,941 | ) |  | $ | (38,961 | )
Income (loss) from continuing operations 1 | $ | (12,264 | ) |  | $ | (31,341 | ) |  | $ | (23,526 | ) |  | $ | 3,985 |  |  | $ | (63,146 | )
Net income (loss)1 | $ | (12,264 | ) |  | $ | (31,341 | ) |  | $ | (23,526 | ) |  | $ | 3,985 |  |  | $ | (63,146 | )
Basic earnings (loss) per share: |  |  |  |  |  |  |  |  |
Continuing operations 1 | $ | (0.41 | ) |  | $ | (1.04 | ) |  | $ | (0.78 | ) |  | $ | 0.13 |  |  | $ | (2.10 | )
Net income (loss)1 | $ | (0.41 | ) |  | $ | (1.04 | ) |  | $ | (0.78 | ) |  | $ | 0.13 |  |  | $ | (2.10 | )
Diluted earnings (loss) per share: |  |  |  |  |  |  |  |  |
Continuing operations 1 | $ | (0.41 | ) |  | $ | (1.04 | ) |  | $ | (0.78 | ) |  | $ | 0.13 |  |  | $ | (2.10 | )
Net income (loss)1 | $ | (0.41 | ) |  | $ | (1.04 | ) |  | $ | (0.78 | ) |  | $ | 0.13 |  |  | $ | (2.10 | )
| Year Ended December 31, 2017
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total Year
Revenues | $ | 286,554 |  |  | $ | 312,256 |  |  | $ | 285,067 |  |  | $ | 316,334 |  |  | $ | 1,200,211 |
Gross margin | $ | 74,804 |  |  | $ | 84,643 |  |  | $ | 68,941 |  |  | $ | 81,611 |  |  | $ | 309,999 |
Operating loss 2 | $ | (12,088 | ) |  | $ | (6,693 | ) |  | $ | (94,116 | ) |  | $ | (2,213 | ) |  | $ | (115,110 | )
Income (loss) from continuing operations 1 | $ | (9,508 | ) |  | $ | (11,086 | ) |  | $ | (83,528 | ) |  | $ | 19,667 |  |  | $ | (84,455 | )
Net income (loss)1 | $ | (9,508 | ) |  | $ | (11,086 | ) |  | $ | (83,528 | ) |  | $ | 19,667 |  |  | $ | (84,455 | )
Basic earnings (loss) per share: |  |  |  |  |  |  |  |  |
Continuing operations 1 | $ | (0.32 | ) |  | $ | (0.37 | ) |  | $ | (2.80 | ) |  | $ | 0.66 |  |  | $ | (2.83 | )
Net income (loss)1 | $ | (0.32 | ) |  | $ | (0.37 | ) |  | $ | (2.80 | ) |  | $ | 0.66 |  |  | $ | (2.83 | )
Diluted earnings (loss) per share: |  |  |  |  |  |  |  |  |
Continuing operations 1 | $ | (0.32 | ) |  | $ | (0.37 | ) |  | $ | (2.80 | ) |  | $ | 0.66 |  |  | $ | (2.83 | )
Net income (loss)1 | $ | (0.32 | ) |  | $ | (0.37 | ) |  | $ | (2.80 | ) |  | $ | 0.66 |  |  | $ | (2.83 | )
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1 | Income (loss) from continuing operations, net income (loss) and the related earnings (loss) per share amounts for each of the quarters in 2018 and the fourth quarter of 2017 are revised from those originally reported to correct errors in income tax expense (benefit) associated with the measurement of valuation allowances on deferred tax assets. Based on an analysis of quantitative and qualitative factors, the Company determined the related impacts were not material to its previously filed annual or interim consolidated financial statements, and therefore, amendments of previously filed reports are not required.
2 | Includes a goodwill impairment loss of $75.2 million in the third quarter of 2017.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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