Stockholders' Equity and Share Based Compensation Plans (Details 1) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Summary of transactions of the Company's stock option plans
Outstanding, Number of Options, Beginning balance	1,116,642	1,229,220
Granted at discount, Number of Options	4,800	75,932
Granted at market value, Number of Options		31,012
Exercised, Number of Options	(64,780)	(273,189)
Forfeited, Number of Options	(1,648)	(7,961)
Outstanding, Number of Options, Ending balance	1,055,014	1,055,014
Outstanding, Weighted Average Exercise Price, Beginning balance	$ 6.10	$ 5.44
Granted at discount, Weighted Average Exercise Price	$ 0.00	$ 0.00
Granted at market value, Weighted Average Exercise Price		$ 29.56
Exercised, Weighted Average Exercise Price	$ 1.01	$ 2.92
Forfeited, Weighted Average Exercise Price	$ 8.63	$ 9.78
Outstanding, Weighted Average Exercise Price, Ending balance	$ 6.38	$ 6.38
Granted at discount, Weighted Average Fair Value	$ 30.78	$ 21.98
Granted at market value, Weighted Average Fair Value		$ 16.70