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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Allowances on accounts receivable, current $ 5,226 $ 6,174
Accumulated depreciation on property and equipment 755,272 651,559
Accumulated amortization on other intangible assets $ 264,674 $ 225,367
Common stock, par value $ 0.00001 $ 0.00001
Common stock, shares authorized 600,000,000 600,000,000
Common stock, shares issued 227,898,509 226,194,656
Common stock, shares outstanding 152,907,166 210,819,790
Treasury stock, common shares 74,991,343 15,374,866
Exchangeable Shares [Member]    
Exchangeable Shares, par value
Common stock, shares issued 6,876,042 7,325,971
Common stock, shares outstanding 6,876,042 7,325,971
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