Accrued Expenses and Other Current Liabilities and Other Liabilities - Other liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Supplemental executive retirement plan obligations	$ 21,184	$ 21,503
Derivative liability	7,953	14,388
Long-term insurance accruals	7,894	7,326
Deferred payroll taxes	5,918	5,918
Unrecognized tax benefits	300	5,465
Other	2,112	1,993
Total	$ 45,361	$ 56,593