Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000	200,000
Common stock, shares issued (in shares)	46,410	46,410
Common stock, shares outstanding (in shares)	40,738	40,738	41,176
Treasury stock, at cost (in shares)	5,672	5,672	5,234