Stock Incentive Plans (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013
Employee Stock Option [Member]
Non-vested stock incentive awards
Beginning Balance, Non-vested, shares	849,000
Beginning of Period, Non-vested , Weighted Average Grant Date Fair Value	$ 8.97
Vested, shares	(322,000)
Vested, Weighted Average Grant Date Fair Value	$ 8.5
Granted, shares	0
Granted, Weighted Average Grant Date Fair Value	$ 0
Terminated, shares	(14,000)
Terminated, Weighted Average Grant Date Fair Value	$ 9.05
Ending Balance, Non-vested, shares	513,000
Ending of Period, Non-vested, Weighted Average Grant Date Fair Value	$ 9.26
Restricted Stock [Member]
Non-vested stock incentive awards
Beginning Balance, Non-vested, shares	601,000
Beginning of Period, Non-vested , Weighted Average Grant Date Fair Value	$ 52.6
Vested, shares	(164,000)
Vested, Weighted Average Grant Date Fair Value	$ 47.5
Granted, shares	364,000
Granted, Weighted Average Grant Date Fair Value	$ 61.97
Terminated, shares	(13,000)
Terminated, Weighted Average Grant Date Fair Value	$ 55.15
Ending Balance, Non-vested, shares	788,000
Ending of Period, Non-vested, Weighted Average Grant Date Fair Value	$ 56.92