Shareholders' Equity and Stock-Based Compensation (Details 3) (USD $)	1 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of common shares issued, treasury shares and shares outstanding
Balance at the beginning of the period (in shares)		51,073,419	51,073,419	50,294,000	49,368,000
Stock options exercised (in shares)			174,000	154,000	238,000
Share repurchases (in shares)			(3,606,000)
Restricted stock and restricted stock units (in shares)			396,000	354,000	420,000
Other (in shares)			267,000	271,000	268,000
Balance at the end of the period (in shares)	48,303,707		48,303,707	51,073,419	50,294,000
Common Stock
Authorized shares (in shares)	200,000,000		200,000,000
Par value (in dollars per share)	10.00		10.00
Summary of common shares issued, treasury shares and shares outstanding
Balance at the beginning of the period (in shares)		98,702,000	98,702,000	98,068,000	97,284,000
Stock options exercised (in shares)			174,000	154,000	238,000
Restricted stock and restricted stock units (in shares)			311,000	209,000	278,000
Other (in shares)			267,000	271,000	268,000
Balance at the end of the period (in shares)	99,454,000		99,454,000	98,702,000	98,068,000
Common Stock In Treasury
Summary of common shares issued, treasury shares and shares outstanding
Balance at the beginning of the period (in shares)		(47,629,000)	(47,629,000)	(47,774,000)	(47,916,000)
Share repurchases (in shares)	(2,600,000)	(1,000,000)	(3,606,000)
Restricted stock and restricted stock units (in shares)			85,000	145,000	142,000
Balance at the end of the period (in shares)	(51,150,000)		(51,150,000)	(47,629,000)	(47,774,000)