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Quarterly financial data (unaudited) | 12 Months Ended
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Dec. 31, 2016
Quarterly financial data (unaudited) [Abstract] |
Quarterly financial data (unaudited) | 18. Quarterly financial data (unaudited) Quarterly financial information for the years ended December 31, 2016 and 2015 is presented in the following tables:
|  | Quarter Ended |
(in thousands, except per share data) |  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
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 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 52,147 |  |  | $ | 119,022 |  |  | $ | 158,378 |  |  | $ | 159,784 |
Income (loss) from operations |  |  | (21,895 | ) |  |  | 35,104 |  |  |  | 63,159 |  |  |  | 65,146 |
Net income (loss) from continuing operations |  |  | (15,728 | ) |  |  | 22,565 |  |  |  | 42,088 |  |  |  | 42,491 |
Net loss from discontinued operations |  |  | (5,792 | ) |  |  | (8,465 | ) |  |  | (5,145 | ) |  |  | (9,144 | )
Net income (loss) |  |  | (21,520 | ) |  |  | 14,100 |  |  |  | 36,943 |  |  |  | 33,347 |
Net income (loss) per share from continuing operations-basic |  | $ | (0.42 | ) |  | $ | 0.59 |  |  | $ | 1.08 |  |  | $ | 1.08 |
Net loss per share from discontinued operations-basic |  |  | (0.15 | ) |  |  | (0.22 | ) |  |  | (0.14 | ) |  |  | (0.23 | )
Net income (loss) per share-basic |  | $ | (0.57 | ) |  | $ | 0.37 |  |  | $ | 0.94 |  |  | $ | 0.85 |
Net income (loss) per share from continuing operations-diluted |  | $ | (0.42 | ) |  | $ | 0.50 |  |  | $ | 0.90 |  |  | $ | 0.90 |
Net loss per share from discontinued operations-diluted |  |  | (0.15 | ) |  |  | (0.18 | ) |  |  | (0.11 | ) |  |  | (0.19 | )
Net income (loss) per share-diluted |  | $ | (0.57 | ) |  | $ | 0.32 |  |  | $ | 0.79 |  |  | $ | 0.71 |
(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 The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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