Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Reconciliation of Weighted Average Common Shares Outstanding

A reconciliation of weighted average shares outstanding used to calculate basic net income per share and diluted net income per share follows:

	Three months ended June 30		Six months ended June 30
	2018	2017	2018	2017
	(in thousands)
Weighted average shares outstanding (basic)	175,764	174,597	175,535	174,375
Impact of common stock equivalents	1,080	935	1,171	1,179
Weighted average shares outstanding (diluted)	176,844	175,532	176,706	175,554