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Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Numerator [Abstract] |  |  |  |  |
Net Income |  | $ 20,945 | $ 33,551 | $ 66,181 | $ 48,652
Interest expense, net of tax |  | 0 | 704 | 0 | 2,445
Amortization of debt issuance costs, net of tax |  | 0 | 195 | 0 | 586
Net income, adjusted |  | $ 20,945 | $ 34,450 | $ 66,181 | $ 51,683
Denominator [Abstract] |  |  |  |  |
Weighted-average number of shares-basic (in shares) |  | 50,071,632 | 41,222,504 | 49,851,082 | 40,989,813
Dilutive securities-equity awards (in shares) |  | 1,415,364 | 1,148,857 | 1,338,598 | 1,003,794
Dilutive securities-convertible debt (in shares) |  | 0 | 8,096,468 | 0 | 8,096,481
Weighted-average number of shares-diluted (in shares) |  | 51,486,996 | 50,467,829 | 51,189,680 | 50,090,088
Net income per share-basic (in dollars per share) |  | $ 0.42 | $ 0.81 | $ 1.33 | $ 1.19
Net income per share-diluted (in dollars per share) | [1] | $ 0.41 | $ 0.68 | $ 1.29 | $ 1.03
Convertible debt [Member] |  |  |  |  |
Antidilutive shares excluded from computation of earnings per share [Abstract] |  |  |  |  |
Interest rate percentage |  |  | 2.875% |  | 2.875%
[1] | See "Earnings per share" footnote for details on calculation.

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