Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Equity [Abstract]

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

The following is a summary of the change in the Company’s outstanding shares of voting common stock:

	Year Ended December 31,
		2014	2013	2012
	(In thousands)
Outstanding shares of voting common stock at the beginning of year		39,224	38,902	37,725
Exercise of stock options		120	256	1,498
Issuance of restricted stock, net of shares withheld for tax payments    and cancellations		116	66	(321	)
Outstanding shares of voting common stock at the end of year		39,460	39,224	38,902