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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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