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Leases - Lease Payments to be Received under Non-Cancellable Operating Leases (Parenthetical) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
[2]
Lessee Lease Description [Line Items]    
Total future minimum lease payments to be received $ 7,950,701 [1] $ 8,223,753
Master Lease    
Lessee Lease Description [Line Items]    
Total future minimum lease payments to be received $ 7,300,000  
[1] Total future minimum lease payments to be received include $7.3 billion relating to the Master Lease with Windstream.
[2] Prior period amounts have not been adjusted under the modified retrospective transition approach