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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Allowances for doubtful accounts on current receivables	$ 16,546	$ 9,398
Accumulated depreciation on property and equipment	1,372,132	1,250,197
Accumulated amortization on other intangible assets	$ 517,574	$ 437,886
Treasury stock, common shares (in shares)	24,410,601	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)	162,710,792	159,415,540
Common stock, shares outstanding (in shares)	138,300,191	142,324,318
Exchangeable Shares
Common stock, shares issued (in shares)	0	36,183
Common stock, shares outstanding (in shares)	0	36,183

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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