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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Allowances on accounts receivable, current $ 5,186 $ 5,215
Accumulated depreciation on property and equipment 657,326 631,939
Accumulated amortization on other intangible assets $ 230,712 $ 223,355
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 600,000,000 600,000,000
Common stock, shares issued 225,801,098 224,968,797
Common stock, shares outstanding 213,450,109 212,942,767
Treasury stock, common shares 12,350,989 12,026,030
Exchangeable Shares [Member]
    
Exchangeable Shares, par value $ 0 $ 0
Common stock, shares issued 4,399,858 3,500,000
Common stock, shares outstanding 4,399,858 3,500,000
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
Series G Preferred Stock [Member]
    
Preferred stock, par value $ 0.00001  
Preferred stock, shares authorized 1 0
Preferred stock, shares issued 1 0
Preferred stock, shares outstanding 1 0