Debt (Schedule Of Debt Outstanding) (Details) (USD $)	9 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Long-term debt	$ 1,209,652,000	$ 1,156,568,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	230,000,000	177,966,000
Revolving Credit Facility maturity date	December 2012
Weighted average rate	1.00%	1.50%
Revolving Credit Facility interest payable terms	interest payable periodically at variable interest rates.
Senior Notes 6.25% Due 2013 [Member]
Debt Instrument [Line Items]
Long-term debt	375,000,000	375,000,000
Senior Notes maturity date	March 2013
Interest rate stated percentage of senior notes	6.25%
Senior Notes interest payable dates	interest payable semi-annually in March and September at 6.25%.
Senior Notes 6.75% Due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt	150,000,000	150,000,000
Senior Notes maturity date	January 2014
Interest rate stated percentage of senior notes	6.75%
Senior Notes interest payable dates	interest payable semi-annually in January and July at 6.75%.
Senior Notes 7.75% Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt	454,652,000	453,602,000
Senior Notes maturity date	June 2017
Interest rate stated percentage of senior notes	7.75%
Senior Notes interest payable dates	interest payable semi-annually in June and December at 7.75%.
Notes issued with a discount	13,400,000
Notes, unamortized	$ 10,300,000	$ 11,400,000

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Interest rate stated in the contractual debt agreement.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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