Stock-Based Compensation (Details) (Stock Option Plan [Member], USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Stock Option Plan [Member]
Summary the stock option transactions
Number of Options Outstanding at January 1, 2014	233,787
Number of Options Exercised	(7,294)
Number of Options Expired	(13,323)
Number of Options Outstanding at June 30, 2014	213,170	233,787
Number of Options Vested and Exercisable at June 30, 2014	213,170
Weighted Average Exercise Price, Outstanding at January 1, 2014	$ 33.38
Weighted Average Exercise Price, Exercised	$ 34.80
Weighted Average Exercise Price, Expired	$ 57.93
Weighted Average Exercise Price, Outstanding at June 30, 2014	$ 31.79	$ 33.38
Weighted Average Exercise Price Vested and Exercisable at June 30, 2014	$ 31.79
Weighted Average Remaining Contractual Term (Years)	1 year 8 months 12 days	2 years 1 month 6 days
Weighted Average Remaining Contractual Term (Years) Vested and Exercisable	1 year 8 months 12 days
Aggregate Intrinsic Value Outstanding at January 1, 2014	$ 4,058,035
Aggregate Intrinsic Value Outstanding at June 30, 2014	2,391,447	4,058,035
Aggregate Intrinsic Value Vested and Exercisable at June 30, 2014	$ 2,391,447