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Share Based Compensation Plans (Details 4) (Stock Equivalent Units [Member], USD $)	12 Months Ended
	Dec. 31, 2012
Stock Equivalent Units [Member]
Summary of transactions of the Company's SEUs
Outstanding, Number of Options, Beginning balance	864,086
Granted at discount, Number of Options	98,128
Granted at market value, Number of Options	7,293
Exercised, Number of Options	(345,679)
Outstanding, Number of Options, Ending balance	623,828
Outstanding, Weighted Average Exercise Price, Beginning balance	$ 2.30
Granted at discount, Weighted Average Exercise Price	$ 0.00
Granted at market value, Weighted Average Exercise Price	$ 29.56
Exercised, Weighted Average Exercise Price	$ 1.05
Outstanding, Weighted Average Exercise Price, Ending balance	$ 2.95
Granted at discount, Weighted Average Fair Value	$ 29.73
Granted at market value, Weighted Average Fair Value	$ 15.20

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Number of share options (or share units) granted during the period at discount.

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