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Share Based Compensation Plans (Details 5) (Stock Equivalent Units [Member], USD $)	12 Months Ended
	Dec. 31, 2012
Summary of information about SEUs outstanding
Number Outstanding	623,828
Number Exercisable and Fully Vested	94,210
$ 0 - $ 5 [Member]
Summary of information about SEUs outstanding
Range of Exercise Price, Lower Range Limit	$ 0
Range of Exercise Price, Upper Range Limit	$ 5
Number Outstanding	529,142
Weighted Average Remaining Life in Years	7 years 7 months 21 days
Weighted Average Exercise Price	$ 0.21
Number Exercisable and Fully Vested	94,210
Weighted Average Remaining Life in Years	6 years 2 months 23 days
Weighted Average Exercise Price	$ 1.17
$10 - $15 [Member]
Summary of information about SEUs outstanding
Range of Exercise Price, Lower Range Limit	$ 10
Range of Exercise Price, Upper Range Limit	$ 15
Number Outstanding	51,259
Weighted Average Remaining Life in Years	7 years 1 month 17 days
Weighted Average Exercise Price	$ 10.38
Number Exercisable and Fully Vested	0
Weighted Average Remaining Life in Years	0 years
Weighted Average Exercise Price	$ 0.00
$25 - $30 [Member]
Summary of information about SEUs outstanding
Range of Exercise Price, Lower Range Limit	$ 25
Range of Exercise Price, Upper Range Limit	$ 30
Number Outstanding	43,427
Weighted Average Remaining Life in Years	8 years 3 months 22 days
Weighted Average Exercise Price	$ 27.52
Number Exercisable and Fully Vested	0
Weighted Average Remaining Life in Years	0 years
Weighted Average Exercise Price	$ 0.00

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