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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Assets [Abstract]    
Property, plant and equipment, accumulated depreciation $ 6,784,318 $ 6,431,843
Amortizable intangible assets, accumulated amortization $ 4,736,420 4,409,312
Accounts receivable, trade allowance for doubtful accounts   $ 25,198
Stockholders' Deficiency:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 100,000,000 100,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Treasury Stock, Shares, Acquired 25,655  
Common stock, shares outstanding (in shares) 457,080,367  
Restricted Investments, Noncurrent $ 2,449,308 $ 2,250,854
Common Class A    
Stockholders' Deficiency:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 4,000,000,000 4,000,000,000
Common stock, shares issued (in shares) 271,309,797 297,203,087
Common stock, shares outstanding (in shares) 271,284,142 290,573,672
Common Class B    
Stockholders' Deficiency:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,000,000,000 1,000,000,000
Common stock, shares outstanding (in shares) 185,796,225 185,895,903
Common Class C    
Stockholders' Deficiency:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 4,000,000,000 4,000,000,000
Common stock, shares issued (in shares) 0 0
Common stock, shares outstanding (in shares) 0 0