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Long-Term Debt (Schedule Of Long-Term Debt Instruments) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Long-Term Debt [Abstract]  
Unsecured senior notes$ 250,000$ 250,000
Acquisition notes payable1,7451,729
Total debt251,745251,729
Current portion of long-term debt(1,142)(1,662)
Long-term debt$ 250,603$ 250,067