Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Stockholders' deficiency:
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in shares)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	103,668,756	101,430,853
Common stock, shares outstanding (in shares)	99,720,901	97,482,998
Common stock in treasury, shares (in shares)	3,947,855	3,947,855