Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

Summary of Share Count and Par Value Data Related to Shareholders' Equity

Share count and par value data related to shareholders' equity are as follows:

	As of December 31,
	2018	2017
Preferred Stock
Par value per share	No par value	No par value
Shares authorized	25,000,000	25,000,000
Shares outstanding	—	—
Common Stock
Par value per share	No par value	No par value
Shares authorized	75,000,000	75,000,000
Shares issued	56,786,849	56,632,488
Shares outstanding	32,750,727	32,938,466
Treasury stock
Shares held	24,036,122	23,694,022

Summary of Common Shares Outstanding

A roll forward of common shares outstanding is as follows:

	As of December 31,
	2018		2017
Balance at beginning of the year	32,938,466		32,762,494
Repurchases	(342,100	)	—
Restricted stock unit issuances	154,361		175,972
Balance at end of period	32,750,727		32,938,466