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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Allowances on accounts receivable, current $ 6,662 $ 4,465
Accumulated depreciation on property and equipment 1,086,424 981,275
Accumulated amortization on other intangible assets $ 364,023 $ 335,507
Common stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Common stock, shares authorized (in shares) 600,000,000 600,000,000
Common stock, shares issued (in shares) 157,280,496 155,219,154
Common stock, shares outstanding (in shares) 148,720,481 153,342,326
Treasury stock, common shares (in shares) 8,560,015 1,876,828
Exchangeable Shares    
Exchangeable shares, par value (in dollars per share) $ 0 $ 0
Common stock, shares issued (in shares) 486,112 486,112
Common stock, shares outstanding (in shares) 486,112 486,112
Series G Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Preferred stock, shares authorized (in shares) 1 1
Preferred stock, shares issued (in shares) 1 1
Preferred stock, shares outstanding (in shares) 1 1