Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Stockholders' equity:
Common Stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, shares authorized (in shares)	100,000,000	100,000,000
Common Stock, shares issued (in shares)	31,966,729	31,704,230
Treasury stock, at cost (in shares)	1,790,873	1,795,082