Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stockholders' equity:
Par value (in dollars per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	85,000	200,000
Shares issued (in shares)	46,410	46,410
Shares outstanding (in shares)	40,738	40,738	40,738
Treasury stock, at cost (in shares)	5,672	5,672	5,672