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Stock Options And Restricted Stock (Schedule Of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years		Dec. 31, 2010 years		Dec. 31, 2009 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable, Number of shares	100,000		100,000		106,667
Exercisable, Weighted-average exercise price	$ 107.28		$ 107.28		$ 104.81
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of shares	100,000		106,667		167,084
Grants, Number of shares
Exercises, Number of shares			(6,667)		(60,417)
Forfeitures, Number of shares
Ending Balance, Number of shares	100,000		100,000		106,667
Vested, Number of shares	100,000
Exercisable, Number of shares	100,000
Beginning Balance, Weighted-average exercise price	$ 107.28		$ 104.81		$ 102.98
Grants, Weighted-average exercise price
Exercises, Weighted-average exercise price			$ 67.84		$ 99.75
Forfeitures, Weighted-average exercise price
Ending Balance, Weighted-average exercise price	$ 107.28		$ 107.28		$ 104.81
Vested, Weighted-average exercise price	$ 107.28
Exercisable, Weighted-average exercise price	$ 107.28
Beginning Balance, Weighted-average remaining contractual life (yrs.)	2.1		2.9		3.7
Ending Balance, Weighted-average remaining contractual life (yrs.)	1.1		2.1		2.9
Vested, Weighted-average remaining contractual life (yrs.)	1.1
Exercisable, Weighted-average remaining contractual life (yrs.)	1.1
Beginning Balance, Aggregate intrinsic value	$ 4,494	[1]	$ 11,489	[1]	$ 18,618	[1]
Ending Balance, Aggregate intrinsic value		[1]	4,494	[1]	11,489	[1]
Vested, Aggregate intrinsic value		[1]
Exercisable, Aggregate intrinsic value		[1]
[1] The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the Company's closing stock price on December 31 of each year and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on December 31 of that year. The amount of aggregate intrinsic value will change based on the fair market value of the Company's stock.

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