Income Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Weighted Average Number of Common Shares Outstanding

The weighted average number of common shares outstanding is calculated as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Weighted average shares outstanding—basic		51,303		51,154		51,259		51,100
Effect of dilutive stock-based compensation		173		180		200		216
Weighted average shares outstanding—diluted		51,476		51,334		51,459		51,316