Other Noncurrent Liabilities (Schedule Of Other Noncurrent Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Other Noncurrent Liabilities [Abstract]
Liabilities related to uncertain tax positions	$ 30,677	[1]	$ 21,875	[1]
Executive deferred compensation plan obligation	16,786		17,763
Deferred revenue - long-term	11,412		13,918
Asset retirement obligations	14,865	[2]	14,213	[2]
Other	37,367		41,042
Total	$ 111,107		$ 108,811

[1] See Note 18, "Income Taxes."

[2] See Note 15, "Commitments and Contingencies."