Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Allowances on accounts receivable, current	$ 14,446	$ 9,398
Accumulated depreciation on property and equipment	1,252,001	1,250,197
Accumulated amortization on other intangible assets	$ 446,573	$ 437,886
Treasury stock, common shares (in shares)	23,643,131	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)	161,289,117	159,415,540
Common stock, shares outstanding (in shares)	137,645,986	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