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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Allowances on accounts receivable, current $ 2,727 $ 5,226
Accumulated depreciation on property and equipment 791,110 755,272
Accumulated amortization on other intangible assets $ 275,755 $ 264,674
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 600,000,000 600,000,000
Common stock, shares issued 228,901,046 227,898,509
Common stock, shares outstanding 153,563,738 152,907,166
Treasury stock, common shares 75,337,308 74,991,343
Exchangeable Shares [Member]    
Exchangeable Shares, par value
Common stock, shares issued 6,876,042 6,876,042
Common stock, shares outstanding 6,876,042 6,876,042
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 $ 0.00001
Preferred stock, shares authorized 1 1
Preferred stock, shares issued 1 1
Preferred stock, shares outstanding 1 1