Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Weighted-Average Number of Shares of Common Stock Used to Calculate Basic and Diluted Earnings Per Share

The table below presents the weighted-average number of shares of common stock used to calculate basic and diluted earnings per share:

	Three Months Ended March 31,
(in thousands)	2018		2017
Weighted-average number of shares of common stock for    calculating basic earnings per share		24,067		23,950
Effect of potentially dilutive securities from    equity-based compensation		411		282
Weighted-average number of shares of common stock for    calculating diluted earnings per share		24,478		24,232

Securities Not Included in Computation of Diluted Earnings Per Share

The following securities were not included in the computation of diluted earnings per share as their effect would have been anti-dilutive:

	Three Months Ended March 31,
(in thousands)	2018		2017
Options to purchase shares of common stock		—		7