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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Allowances on accounts receivable, current $ 14,948 $ 9,398
Accumulated depreciation on property and equipment 1,298,054 1,250,197
Accumulated amortization on other intangible assets $ 469,006 $ 437,886
Treasury stock, common shares (in shares) 23,656,415 17,091,222
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) 161,368,227 159,415,540
Common stock, shares outstanding (in shares) 137,711,812 142,324,318
Exchangeable Shares    
Exchangeable shares, par value (in dollars per share) $ 0 $ 0
Common stock, shares issued (in shares) 0 36,183
Common stock, shares outstanding (in shares) 0 36,183