Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 10, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 116,282	$ 144,330	$ 495,000
Other current liabilities	$ 58,386	57,910
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Deferred Long-term Liability Charges
Operating lease liabilities	$ 82,904	84,795
Total	$ 141,290	142,705
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:AccountsPayableCurrent
Property and equipment, gross	$ 6,912,544	7,261,038
Accumulated depreciation	(4,592,449)	(4,554,856)
Property and equipment, net	2,320,095	2,706,182
Other current liabilities	62,965	61,493
Other long-term liabilities	154,782	171,706
Total	$ 217,747	$ 233,199
Operating Lease, Weighted Average Remaining Lease Term	3 years	3 years 1 month 6 days
Finance Lease, Weighted Average Remaining Lease Term	3 years 7 months 6 days	3 years 9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	4.80%	5.00%
Finance Lease, Weighted Average Discount Rate, Percent	10.20%	10.20%
Asset Impairment Charges	$ 356,418
Property and equipment [Member]
Lessee, Lease, Description [Line Items]
Property and equipment, gross	890,598	$ 890,598
Accumulated depreciation	(701,174)	(683,271)
Property and equipment, net	189,424	$ 207,327
NBIoT capitalized costs
Lessee, Lease, Description [Line Items]
Asset Impairment Charges	253,000
NBIoT capitalized costs | Operating Lease Assets [Member]
Lessee, Lease, Description [Line Items]
Asset Impairment Charges	$ 26,556