Stock-Based Compensation (Details) (Stock Option Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Option Plan [Member]
Summary the stock option transactions
Number of Options Outstanding	260,660	303,632	391,948
Number of Options Granted	0	0	0
Number of Options Exercised	(8,910,000)	(9,796,000)	0
Number of Options Forfeited/canceled/Expired	(17,963)	(33,176)	(88,316)
Number of Options Outstanding	233,787	260,660	303,632
Number of Options Vested and Exercisable	233,787
Weighted Average Exercise Price, Outstanding	$ 34.69	$ 37.40	$ 38.78
Weighted Average Exercise Price, Granted	$ 0	$ 0	$ 0
Weighted Average Exercise Price, Exercised	$ 29.41	$ 27.26	$ 0
Weighted Average Exercise Price, Forfeited/canceled/expired	$ 54.35	$ 61.69	$ 43.50
Weighted Average Exercise Price, Outstanding	$ 33.38	$ 34.69	$ 37.40
Weighted Average Exercise Price Vested and Exercisable	$ 33.38
Weighted Average Remaining Contractual Term (Years)	2 years 1 month 6 days	3 years	3 years 7 months 6 days
Weighted Average Remaining Contractual Term (Years) Vested and Exercisable	2 years 1 month 6 days
Aggregate Intrinsic Value Outstanding	$ 4,058,035	$ 1,253,039	$ 135,886
Aggregate Intrinsic Value Vested and Exercisable	$ 4,058,035