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Supplemental Disclosures Of Cash Flow Information And Non-Cash Financing And Investing Activities (Summary Of Supplemental Disclosures Of Cash Flow Information And Non-Cash Financing And Investing Activities) (Details) (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Supplemental Disclosures Of Cash Flow Information And Non-Cash Financing And Investing Activities [Abstract]  
Interest$ 13,379$ 10,858
Income taxes51,94947,488
Notes payable issued or assumed for purchased customer accounts1,8592,274
Estimated acquisition earn-out payables and related changes15,46320,957
Notes receivable on the sale of fixed assets and customer accounts$ 6,710$ 1,204