Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

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

	As of
	December 31, 2014		December 31, 2013
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		56,101,700		55,808,008
Shares outstanding		33,392,060		33,558,864
Treasury stock
Shares held		22,709,640		22,249,144

Summary of Common Shares Outstanding

	As of
	December 31, 2014			December 31, 2013
Balance at the beginning of the year		33,558,864			33,433,128
Repurchases		(460,496	)		(419,190	)
Stock option issuances		101,350			266,043
Restricted share issuances		192,342			278,883
Restricted share forfeitures		—			—
Shares withheld for tax obligations		—			—
Balance at the end of the period		33,392,060			33,558,864

Common Stock [Member]

Potentially Dilutive Securities Earnings Per Share

	For the Year Ended December 31,
	2014		2013		2012
Potentially dilutive securities		—		634		—