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Quarterly financial data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly financial data (unaudited) [Abstract] |
Quarterly financial information | Quarterly financial information for the years ended December 31, 2017 and 2016 is presented in the following tables:
|  | Quarter Ended |
(in thousands, except per share data) |  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
2017: |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 116,858 |  |  | $ | 100,772 |  |  | $ | 149,434 |  |  | $ | 193,809 |
Income from operations |  |  | 14,910 |  |  |  | 8,529 |  |  |  | 47,769 |  |  |  | 53,077 |
Net income |  |  | 10,485 |  |  |  | 4,616 |  |  |  | 33,551 |  |  |  | 33,942 |
Net income per share-basic |  | $ | 0.26 |  |  | $ | 0.11 |  |  | $ | 0.81 |  |  | $ | 0.77 |
Net income per share-diluted |  | $ | 0.23 |  |  | $ | 0.11 |  |  | $ | 0.68 |  |  | $ | 0.67 |
2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 102,964 |  |  | $ | 91,241 |  |  | $ | 142,914 |  |  | $ | 151,663 |
Income (loss) from operations |  |  | 21,157 |  |  |  | (2,042 | ) |  |  | 35,478 |  |  |  | 50,929 |
Net income (loss) from continuing operations |  |  | 11,889 |  |  |  | (2,042 | ) |  |  | 20,388 |  |  |  | 32,289 |
Net income (loss) from discontinued operations (1) |  |  | (7,898 | ) |  |  | (8,905 | ) |  |  | 952 |  |  |  | 5,103 |
Net income (loss) |  |  | 3,991 |  |  |  | (10,947 | ) |  |  | 21,340 |  |  |  | 37,392 |
Net income (loss) per share from continuing operations-basic |  | $ | 0.30 |  |  | $ | (0.05 | ) |  | $ | 0.50 |  |  | $ | 0.80 |
Net income (loss) per share from discontinued operations-basic |  |  | (0.20 | ) |  |  | (0.22 | ) |  |  | 0.02 |  |  |  | 0.13 |
Net income (loss) per share-basic |  | $ | 0.10 |  |  | $ | (0.27 | ) |  | $ | 0.52 |  |  | $ | 0.93 |
Net income (loss) per share from continuing operations-diluted |  | $ | 0.26 |  |  | $ | (0.05 | ) |  | $ | 0.43 |  |  | $ | 0.67 |
Net income (loss) per share from discontinued operations-diluted |  |  | (0.16 | ) |  |  | (0.22 | ) |  |  | 0.02 |  |  |  | 0.10 |
Net income (loss) per share-diluted |  | $ | 0.10 |  |  | $ | (0.27 | ) |  | $ | 0.45 |  |  | $ | 0.77 |
(1) Reflects a change in estimate attributed to higher pretax income within continuing operations. According to the ordering rules of intraperiod tax allocation, the residual amount of change after determining the effective rate for continuing operations is allocated to discontinued operations.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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