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Long-Term Debt (Schedule Of Long-Term Debt Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Long-Term Debt [Abstract]    
Unsecured Senior Notes $ 250,000 $ 250,000
Acquisition notes payable 1,260 1,729
Revolving credit facility      
Other notes payable      
Total debt 251,260 251,729
Less current portion (1,227) (1,662)
Long-term debt $ 250,033 $ 250,067