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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Allowances on accounts receivable, current $ 5,215 $ 5,447
Accumulated depreciation on property and equipment 631,939 555,030
Accumulated amortization on other intangible assets $ 223,355 $ 198,082
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 600,000,000 600,000,000
Common stock, shares issued 224,968,797 220,917,050
Common stock, shares outstanding 212,942,767 209,270,586
Treasury stock, common shares 12,026,030 11,646,464
Exchangeable Shares [Member]
    
Exchangeable Shares, par value $ 0 $ 0
Common stock, shares issued 3,500,000 3,909,110
Common stock, shares outstanding 3,500,000 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