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Quarterly financial data (unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly financial data (unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 193,809 | $ 149,434 | $ 100,772 | $ 116,858 | $ 151,663 |  | $ 142,914 |  | $ 91,241 |  | $ 102,964 |  | $ 560,873 |  | $ 488,782 |  | $ 489,331 |
Income (loss) from operations | 53,077 | 47,769 | 8,529 | 14,910 | 50,929 |  | 35,478 |  | (2,042) |  | 21,157 |  |  |  |  |  |  |
Net income from continuing operations | $ 33,942 | $ 33,551 | $ 4,616 | $ 10,485 | 32,289 |  | 20,388 |  | (2,042) |  | 11,889 |  | 82,594 |  | 62,524 |  | 91,416 |
Net loss from discontinued operations |  |  |  |  | 5,103 | [1] | 952 | [1] | (8,905) | [1] | (7,898) | [1] | $ 0 |  | $ (10,748) |  | $ (28,546) |
Net income (loss) |  |  |  |  | $ 37,392 |  | $ 21,340 |  | $ (10,947) |  | $ 3,991 |  |  |  |  |  |  |
Net income (loss) per share from continuing operations-basic (in dollars per share) | $ 0.77 | $ 0.81 | $ 0.11 | $ 0.26 | $ 0.80 |  | $ 0.50 |  | $ (0.05) |  | $ 0.30 |  | $ 1.98 |  | $ 1.56 |  | $ 2.37 |
Net loss per share from discontinued operations-basic (in dollars per share) |  |  |  |  | 0.13 |  | 0.02 |  | (0.22) |  | (0.20) |  | 0 |  | (0.27) |  | (0.74) |
Net income per share-basic (in dollars per share) |  |  |  |  | 0.93 |  | 0.52 |  | (0.27) |  | 0.10 |  | 1.98 |  | 1.29 |  | 1.63 |
Net income per share from continuing operations-diluted (in dollars per share) | $ 0.67 | $ 0.68 | $ 0.11 | $ 0.23 | 0.67 |  | 0.43 |  | (0.05) |  | 0.26 |  | 1.71 |  | 1.35 |  | 2.02 |
Net income (loss) per share from discontinued operations-diluted (in dollars per share) |  |  |  |  | 0.10 |  | 0.02 |  | (0.22) |  | (0.16) |  | 0 |  | (0.22) |  | (0.61) |
Net income per share-diluted (in dollars per share) |  |  |  |  | $ 0.77 |  | $ 0.45 |  | $ (0.27) |  | $ 0.10 |  | $ 1.71 | [2] | $ 1.13 | [2] | $ 1.41 | [2]
[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.
[2] | See "Earnings per share" footnote for details on calculation.

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