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Long-Term Debt (Schedule of Long-Term Debt Instruments) (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Long-Term Debt    
Unsecured senior notes $ 250,000 $ 250,000
Acquisition notes payable 1,691 1,729
Total debt 251,691 251,729
Current portion of long-term debt (1,624) (1,662)
Long-term debt $ 250,067 $ 250,067