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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Allowances on accounts receivable, current $ 4,465 $ 2,752
Accumulated depreciation on property and equipment 981,275 862,825
Accumulated amortization on other intangible assets $ 335,507 $ 297,313
Common stock, par value (in usd per share) $ 0.00001 $ 0.00001
Common stock, shares authorized (in shares) 600,000,000 600,000,000
Common stock, shares issued (in shares) 155,219,154 144,710,773
Common stock, shares outstanding (in shares) 153,342,326 144,710,773
Treasury stock, common shares (in shares) 1,876,828 0
Exchangeable Shares    
Common stock, shares issued (in shares) 486,112 6,515,453
Common stock, shares outstanding (in shares) 486,112 6,515,453
Exchangeable shares, par value (in usd per share)
Series F Preferred Stock    
Preferred stock, par value (in usd per share) $ 0.00001 $ 0.00001
Preferred stock, shares authorized (in shares) 0 1
Preferred stock, shares issued (in shares) 0 1
Preferred stock, shares outstanding (in shares) 0 1
Series G Preferred Stock    
Preferred stock, par value (in usd 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