Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets		$ 853,140	$ 104,271
Other current liabilities		$ 53,257	56,856
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]		Deferred Long-term Liability Charges
Operating lease liabilities		$ 818,931	63,526
Total		$ 872,188	120,382
Operating Lease, Liability, Statement of Financial Position [Extensible List]		us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:AccountsPayableCurrent
Property and equipment, gross		$ 7,642,926	6,965,949
Accumulated depreciation		(4,909,124)	(4,783,616)
Property and equipment, net		2,733,802	2,182,333
Other current liabilities		39,221	58,379
Other long-term liabilities		73,080	103,795
Total		$ 112,301	$ 162,174
Operating Lease, Weighted Average Remaining Lease Term		12 years 7 months 6 days	2 years 9 months 18 days
Finance Lease, Weighted Average Remaining Lease Term		2 years 8 months 12 days	3 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent		4.50%	4.20%
Finance Lease, Weighted Average Discount Rate, Percent		10.80%	10.40%
Asset Impairment Charges	$ 356,418
Property and equipment [Member]
Lessee, Lease, Description [Line Items]
Property and equipment, gross		$ 889,708	$ 889,708
Accumulated depreciation		(807,780)	(754,292)
Property and equipment, net		$ 81,928	$ 135,416
NBIoT capitalized costs
Lessee, Lease, Description [Line Items]
Asset Impairment Charges	253,000
NBIoT capitalized costs | Operating lease assets
Lessee, Lease, Description [Line Items]
Asset Impairment Charges	$ 26,556