Share-Based Compensation (Details) (Stock Options [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options [Member]
Summary of outstanding stock options
Number of options outstanding, beginning balance	3,045,000	6,809,000	7,733,000
Weighted average exercise price, beginning balance	$ 28.39	$ 26.47	$ 26.53
Number of options, exercised	(44,000)	(2,253,000)	(203,000)
Weighted average exercise price options, exercised	$ 22.52	$ 21.75	$ 8.99
Number of options, forfeited	(10,000)	(1,511,000)	(721,000)
Weighted average exercise price options, forfeited	$ 27.82	$ 29.66	$ 32.09
Number of options outstanding, ending balance	2,991,000	3,045,000	6,809,000
Weighted average exercise price, ending balance	$ 28.48	$ 28.39	$ 26.47
Number of options exercisable at end of year	2,991,000	2,841,000	6,146,000
Weighted average exercise price, exercisable	$ 28.48	$ 29.79	$ 27.50