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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEETS    
Accounts receivable, allowance for doubtful accounts $ 12,092 $ 10,372
Land and depreciable assets, accumulated depreciation $ 781,904 $ 715,895