Stock Based Compensation (Details) (Stock Option Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Option Plan [Member]
Summary the stock option transactions
Number of Options Outstanding at begining	303,662	391,948	517,905
Number of Options Granted	0	0	0
Number of Options Exercised	(9,796)	0	0
Number of Options Forfeited/canceled/expired	(33,176)	(88,316)	(125,957)
Number of Options Outstanding at ending	260,660	303,662	391,948
Vested and Exercisable at December 31, 2012	260,660
Outstanding , Weighted Average Exercise Price Outstanding, at begining	$ 37.40	$ 38.78	$ 40.92
Weighted Average Exercise Price, Granted	$ 0	$ 0	$ 0
Weighted Average Exercise Price, Exercised	$ 27.26	$ 0	$ 0
Weighted Average Exercise Price, Forfeited/canceled/expired	$ 61.69	$ 43.50	$ 47.61
Outstanding , Weighted Average Exercise Price Outstanding, at ending	$ 34.69	$ 37.40	$ 38.78
Weighted Average Exercise Price, Outstanding and exercisable	$ 34.69
Weighted Average Remaining Contractual Term (Years)	3 years	3 years 7 months 6 days	3 years 10 months 24 days
Weighted Average Remaining Contractual Term (Years), Outstanding and exercisable	3 years
Aggregate Intrinsic Value Outstanding	$ 1,253,039	$ 135,886	$ 0
Aggregate Intrinsic Value, Outstanding and exercisable	$ 1,253,039