Stock Incentive Plans (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012
Number of Options
Number of Options, Outstanding at beginning of year	5,837,653
Expired (in shares)	(2,990,803)
Number of Options, Outstanding and exercisable at end of year	2,846,850
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding at beginning of year	$ 24.41
Expired (in dollar per shares)	$ (23.18)
Weighted Average Exercise Price, Outstanding and exercisable at end of year	$ 25.70