Leases - Supplemental balance sheet information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Leases
Operating lease assets	$ 92,972	$ 130,454
Other current liabilities	$ 36,618	$ 60,203
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Accrued Liabilities, Current	Other Accrued Liabilities, Current
Operating lease liabilities	$ 61,381	$ 75,142
Total operating lease liabilities	$ 97,999	$ 135,345
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Operating lease liabilities, Other Accrued Liabilities, Current	Operating lease liabilities, Other Accrued Liabilities, Current
Property and equipment, gross	$ 4,344,935	$ 4,431,071
Accumulated depreciation	(3,536,870)	(3,440,185)
Property and equipment, net	808,065	990,886
Other current liabilities	$ 31,104	$ 38,102
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Long-term Debt and Capital Lease Obligations, Current	Long-term Debt and Capital Lease Obligations, Current
Other long-term liabilities		$ 31,104
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term Debt, Excluding Current Maturities	Long-term Debt, Excluding Current Maturities
Total finance lease liabilities	$ 31,104	$ 69,206
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Contract with Customer, Liability, Noncurrent and Other Long Term Liabilities	Contract with Customer, Liability, Noncurrent and Other Long Term Liabilities
Weighted Average Remaining Lease Term: Operating leases	4 years 1 month 6 days	3 years 8 months 12 days
Weighted Average Remaining Lease Term: Finance leases	9 months 18 days	1 year 9 months 18 days
Weighted Average Discount Rate: Operating leases	8.30%	7.20%
Weighted Average Discount Rate: Finance leases	10.00%	10.00%
Property and equipment
Leases
Property and equipment, gross	$ 175,704	$ 175,704
Accumulated depreciation	(149,917)	(115,469)
Property and equipment, net	$ 25,787	$ 60,235