Shareholders' Equity and Stock-Based Compensation (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of common shares issued, treasury shares and shares outstanding
Balance at the beginning of the period (in shares)	50,294,261	49,368,000	51,128,000
Stock options exercised (in shares)	154,000	238,000	154,000
Share repurchases (in shares)			(2,625,000)
Restricted stock and restricted stock units (in shares)	354,000	420,000	364,000
Other (in shares)	271,000	268,000	347,000
Balance at the end of the period (in shares)	51,073,419	50,294,261	49,368,000
Common Stock
Authorized shares (in shares)	200,000,000
Par value (in dollars per share)	10.00
Summary of common shares issued, treasury shares and shares outstanding
Balance at the beginning of the period (in shares)	98,068,000	97,284,000	96,523,000
Stock options exercised (in shares)	154,000	238,000	154,000
Restricted stock and restricted stock units (in shares)	209,000	278,000	260,000
Other (in shares)	271,000	268,000	347,000
Balance at the end of the period (in shares)	98,702,000	98,068,000	97,284,000
Common Stock In Treasury
Summary of common shares issued, treasury shares and shares outstanding
Balance at the beginning of the period (in shares)	(47,774,000)	(47,916,000)	(45,395,000)
Share repurchases (in shares)			(2,625,000)
Restricted stock and restricted stock units (in shares)	145,000	142,000	104,000
Balance at the end of the period (in shares)	(47,629,000)	(47,774,000)	(47,916,000)