SUPPLEMENTAL FINANCIAL INFORMATION - Accrued Expenses and Other Current Liabilities and Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accrued expenses and other current liabilities:
Accrued compensation	$ 56,310	$ 56,337
Accrued expenses	52,044	39,875
Operating lease obligation	17,855	17,854
Accrued interest	16,417	39,245
Accrued taxes	14,197	12,603
Accrual for license fee dispute	10,147	10,191
In-orbit incentive obligations	4,737	5,369
Trade accounts payable	82,291	101,239
Other	18,928	17,710
Total accrued expenses and other current liabilities	192,100	199,853
Other non-current liabilities:
Accrual for license fee dispute	50,502	57,292
In-orbit incentive obligations	42,324	44,836
Contract liabilities	6,999	8,326
Other	9,571	9,333
Total other non-current liabilities	$ 109,396	$ 119,787
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Total accrued expenses and other current liabilities	Total accrued expenses and other current liabilities
Related Party
Accrued expenses and other current liabilities:
Trade accounts payable	$ 1,465	$ 669