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Earnings per share (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
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Interest expense, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 2,606 |  | 3,255 |  | 3,019 |
Amortization of debt issuance costs, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 681 |  | 781 |  | 868 |
Net income, adjusted from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  | 85,881 |  | 66,560 |  | 95,303 |
Net loss from discontinued operations |  |  |  |  | $ 5,103 | [1] | $ 952 | [1] | $ (8,905) | [1] | $ (7,898) | [1] | 0 |  | (10,748) |  | (28,546) |
Net income, adjusted |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,881 |  | $ 55,812 |  | $ 66,757 |
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of shares-basic (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 41,816,431 |  | 40,184,159 |  | 38,595,435 |
Dilutive securities-equity awards (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,115,244 |  | 1,054,453 |  | 939,882 |
Dilutive securities-convertible debt (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 7,396,262 |  | 8,096,500 |  | 7,720,525 |
Weighted-average number of shares-diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 50,327,937 |  | 49,335,112 |  | 47,255,842 |
Net income 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-diluted from continuing operations (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 loss per share-diluted from discontinued operations (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]
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive shares excluded from calculation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |
[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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