Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 10, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 152,178	$ 495,000
Other current liabilities	57,737
Operating lease liabilities	92,796
Total	150,533
Property and equipment, gross	7,261,727		$ 5,688,678
Accumulated depreciation	(4,503,703)		(3,760,498)
Property and equipment, net	2,758,024		1,928,180
Other current liabilities	63,483
Other long-term liabilities	188,221
Total	$ 251,704		$ 66,984
Operating Lease, Weighted Average Remaining Lease Term	3 years 2 months 12 days
Finance Lease, Weighted Average Remaining Lease Term	4 years
Operating Lease, Weighted Average Discount Rate, Percent	5.10%
Finance Lease, Weighted Average Discount Rate, Percent	10.20%
Property and equipment
Lessee, Lease, Description [Line Items]
Property and equipment, gross	$ 890,598
Accumulated depreciation	(665,367)
Property and equipment, net	$ 225,231