Share-Based Payments (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013
Stock Option Activity
Beginning Balance, Outstanding shares	907,000
Beginning Balance, Weighted Average Exercise Price	$ 54.48
Shares, Granted	0
Weighted Average Exercise Price, Granted	$ 0.00
Shares, Exercised	(523,000)
Weighted Average Exercise Price, Exercised	$ 53.73
Shares, Cancelled	0
Weighted Average Exercise Price, Cancelled	$ 0.00
Ending Balance, Outstanding shares	384,000
Ending Balance, Weighted Average Exercise Price	$ 55.49