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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Allowances on accounts receivable, current $ 5,447 $ 3,751
Accumulated depreciation on property and equipment 555,030 474,670
Accumulated amortization on other intangible assets $ 198,082 $ 159,996
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 600,000,000 600,000,000
Common stock, shares issued 220,917,050 217,479,462
Common stock, shares outstanding 209,270,586 206,203,005
Treasury stock, common shares 11,646,464 11,276,457
Exchangeable Shares [Member]
    
Exchangeable Shares, par value      
Common stock, shares authorized 3,909,110 3,909,110
Common stock, shares issued 3,909,110 3,909,110
Common stock, shares outstanding 3,909,110 3,909,110
Series F Preferred Stock [Member]
    
Preferred stock, par value $ 0.00001 $ 0.00001
Preferred stock, shares authorized 1 1
Preferred stock, shares issued 1 1
Preferred stock, shares outstanding 1 1