Net Income per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Reconciliation of Basic to Diluted Net Income per Share

The following is a reconciliation of basic to diluted net income per share:

	Quarter Ended				Year to Date Ended
	June 30, 2018		June 30, 2017		June 30, 2018		June 30, 2017
Net income	$	19,007	$	15,384	$	28,008	$	25,710
Shares used in net income per common share - basic		28,979		28,978		29,085		28,873
Incremental shares of unvested restricted common stock		110		136		160		169
Shares used in net income per common share - diluted		29,089		29,114		29,245		29,042
Earnings per share:
Basic net income	$	0.66	$	0.53	$	0.96	$	0.89
Diluted net income	$	0.65	$	0.53	$	0.96	$	0.89