Earnings per share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings per share [Abstract]

Basic and Diluted Net Income per Share

The following table presents the calculation of basic and diluted net income per share:

	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands, except share and per share data)	2018		2017		2018		2017
Numerator:
Net income	$	20,945	$	33,551	$	66,181	$	48,652
Interest expense on convertible debt, net of tax		-		704		-		2,445
Amortization of convertible debt issuance costs, net of tax		-		195		-		586
Net income, adjusted	$	20,945	$	34,450	$	66,181	$	51,683
Denominator:
Weighted-average number of shares—basic		50,071,632		41,222,504		49,851,082		40,989,813
Dilutive securities—equity awards		1,415,364		1,148,857		1,338,598		1,003,794
Dilutive securities—convertible debt		-		8,096,468		-		8,096,481
Weighted-average number of shares—diluted		51,486,996		50,467,829		51,189,680		50,090,088
Net income per share - basic	$	0.42	$	0.81	$	1.33	$	1.19
Net income per share - diluted	$	0.41	$	0.68	$	1.29	$	1.03