Share Based Compensation (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation expense	$ 21,200,000	$ 13,700,000	$ 106,700,000
Previously Unrecognized Compensation Expense Related to Restricted Stock and Stock Option Granted	21,244,000	13,746,000	106,725,000
Option to purchase common stock available for grant	15,500,000	17,300,000
Total Future Compensation expected to vest, Unvested Options	4,000,000
Weighted Average Period for Cost recognition	2
Share Based Compensation (Textual) [Abstract]
Tax benefit realized from share based awards	200,000	100,000	300,000
Options outstanding exercisable at weighted average	24,939,000	24,900,000	27,200,000
Weighted average exercise prices of options outstanding	$ 19.83	$ 20.19	$ 21.04
Granted, Shares	931,000	32,115	10,015,883
Aggregate value of restricted stock awards at date of grant	30,000,000	11,900,000
Total intrinsic value of stock option exercised	18,300,000	6,900,000	19,700,000
Total fair value of option vested during the period	5,200,000	5,600,000	10,800,000
Stock option plan expiration period	More than 10 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	3 to 5 years
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation expense	13,400,000	10,500,000	88,900,000
Fair value of Restricted Stock Awarded to Employees and Directors that vested	21,400,000	26,700,000	23,900,000
Option to purchase common stock available for grant	15,500,000
Total Future Compensation expected to vest, Unvested Options	28,900,000
Vesting period of shares	3 to 5 Years
Previously Unrecognized [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Previously Unrecognized Compensation Expense Related to Restricted Stock and Stock Option Granted			$ 72,100,000
Restricted stock awards granted to directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of shares	Up to 4 years
Employees and Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Awarded to Employees and Directors	1,096,379	538,496
Unvested Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Period for Cost recognition	2