Fair Value Disclosures (Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Deferred compensation plan investments	$ 35,000,000	[1]	$ 41,000,000	[1]
Derivative financial instruments, assets	0		100,000
Derivative financial instruments, Liabilities	0		16,600,000
Participant Withdrawals From Deferred Compensation Plan Investments	12,100,000
Fair Value, Inputs, Level 1 [Member]
Deferred compensation plan investments	35,000,000	[1]	41,000,000	[1]
Derivative financial instruments, assets	0		0
Derivative financial instruments, Liabilities	0		0
Fair Value, Inputs, Level 2 [Member]
Deferred compensation plan investments	0	[1]	0	[1]
Derivative financial instruments, assets	0		100,000
Derivative financial instruments, Liabilities	0		16,600,000
Fair Value, Inputs, Level 3 [Member]
Deferred compensation plan investments	0	[1]	0	[1]
Derivative financial instruments, assets	0		0
Derivative financial instruments, Liabilities	$ 0		$ 0

[1] (1) Approximately $12.1 million of participant cash was withdrawn from our deferred compensation plan investments during the year ended December 31, 2012.