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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Allowances on accounts receivable, current $ 5,839 $ 4,465
Accumulated depreciation on property and equipment 1,092,440 981,275
Accumulated amortization on other intangible assets $ 372,081 $ 335,507
Treasury stock, common shares (in shares) 16,229,146 1,876,828
Common Stock    
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) 157,333,046 155,219,154
Common stock, shares outstanding (in shares) 141,103,900 153,342,326
Exchangeable Shares    
Common stock, shares issued (in shares) 486,112 486,112
Common stock, shares outstanding (in shares) 486,112 486,112
Exchangeable shares, par value (in dollars per share)
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