Other Receivables and Current Assets and Other Accrued Expenses and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Other Receivables and Current Assets and Other Accrued Expenses and Liabilities [Abstract]
Receivables related to unrecognized revenue	$ 157,924	$ 253,646
Income taxes receivable, including overpayments and refunds	25,091	22,104
Prepaid expenses and other current assets	65,412	48,901
Total other receivables and current assets	248,427	324,651
Accrued vacation	38,333	42,435
Accrued expenses and other current liabilities	132,846	173,210
Total other accrued expenses and liabilities	$ 171,179	$ 215,645