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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

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