Leases - Lease Payments to be Received under Non-Cancellable Operating Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	[1]	Dec. 31, 2018	[2]
Leases [Abstract]
2019	$ 351,179		$ 724,269
2020	705,063		693,596
2021	708,110		696,713
2022	710,922		699,561
2023	713,902		702,663
Thereafter	4,761,525		4,706,951
Total lease receivables	$ 7,950,701		$ 8,223,753

[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