Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Summary of the Change in the Company's Outstanding Shares of Common Stock

	Year Ended December 31,
		2016		2015		2014
	(In thousands)
Outstanding shares of voting common stock at the beginning of year		37,409		37,319		37,729
Exercise of stock options		181		183		120
Issuance of restricted stock, net of shares withheld for tax payments    and cancellations		104		178		116
Repurchases		(150	)	(271	)	(646	)
Outstanding shares of voting common stock at the end of year		37,544		37,409		37,319