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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
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities    
Interest $ 7,212 $ 7,221
Income taxes 32,914 31,425
Unrealized holding loss on available-for-sale securities, net of tax benefit of $0 for 2011 and $1 for 2010 (2) (2)
Notes payable issued or assumed for purchased customer accounts 1,206 1,210
Estimated acquisition earn-out payables and related changes 13,815 9,101
Notes receivable on the sale of fixed assets and customer accounts 6,104 707
Unrealized holding loss on available-for-sale securities, tax benefit $ 1 $ 1