Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Stockholders' deficiency:
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common Stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	93,658,273	83,022,812
Common stock, shares outstanding (in shares)	89,898,411	79,441,991
Common stock in treasury, shares (in shares)	3,759,862	3,580,821