Earnings per share (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
(in thousands, except share and per share data)	2018		2017		2018		2017
Numerator:
Net income	$	50,144	$	4,616	$	45,236	$	15,101
Interest expense on convertible debt, net of tax		-		835		-		1,742
Amortization of convertible debt issuance costs, net of tax		-		195		-		391
Net income, adjusted	$	50,144	$	5,646	$	45,236	$	17,234
Denominator:
Weighted-average number of shares—basic		49,896,124		41,013,764		49,738,980		40,871,540
Dilutive securities—equity awards		1,266,785		968,354		1,300,215		931,263
Dilutive securities—convertible debt		-		8,096,476		-		8,096,488
Weighted-average number of shares—diluted		51,162,909		50,078,594		51,039,195		49,899,291
Net income per share - basic	$	1.00	$	0.11	$	0.91	$	0.37
Net income per share - diluted	$	0.98	$	0.11	$	0.89	$	0.35