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Intangible Assets, Net (Gross and Net Carrying Amounts for each Major Class of Intangible Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 7,133,568 $ 7,063,235
Accumulated amortization (4,609,948) (4,286,763)
Net book value 2,523,620 2,776,472
Current Contract Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 5,219,410 5,170,187
Accumulated amortization (3,304,831) (3,060,494)
Net book value 1,914,579 2,109,693
Network Location Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 1,914,158 1,893,048
Accumulated amortization (1,305,117) (1,226,269)
Net book value $ 609,041 $ 666,779