Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowances on accounts receivable, current	$ 39,709	$ 16,546
Accumulated depreciation on property and equipment	1,481,416	1,372,132
Accumulated amortization on other intangible assets	$ 582,126	$ 517,574
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)	165,007,258	162,710,792
Common stock, shares outstanding (in shares)	139,111,888	138,300,191
Treasury stock, common shares (in shares)	25,895,370	24,410,601