Equity-based Incentive Plans (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012
Range of Exercise Price $5 to $10
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 5
Exercise price per share, high end of the range (in dollars per share)	$ 10
Exercisable Options (in shares)	1,153,760
Weighted Average Remaining Contractual Life	10 months 24 days
Weighted Average Exercise Price Exercisable Options (in dollars per share)	$ 5.23
Range of Exercise Price $10 to $15
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 10
Exercise price per share, high end of the range (in dollars per share)	$ 15
Exercisable Options (in shares)	2,869,366
Weighted Average Remaining Contractual Life	2 years 10 months 24 days
Weighted Average Exercise Price Exercisable Options (in dollars per share)	$ 13.14
Range of Exercise Price $15 to $20
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 15
Exercise price per share, high end of the range (in dollars per share)	$ 20
Exercisable Options (in shares)	2,617,981
Weighted Average Remaining Contractual Life	2 years 9 months 18 days
Weighted Average Exercise Price Exercisable Options (in dollars per share)	$ 16.39
Range of Exercise Price $35 to $40
Stock options outstanding and exercisable by exercise price range
Exercise price per share, low end of the range (in dollars per share)	$ 35
Exercise price per share, high end of the range (in dollars per share)	$ 40
Exercisable Options (in shares)	432,602
Weighted Average Remaining Contractual Life	4 months 24 days
Weighted Average Exercise Price Exercisable Options (in dollars per share)	$ 37.84