Accrued Expenses and Other Current Liabilities and Other Liabilities - Other liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accrued Expenses and Other Current Liabilities and Other Liabilities
Supplemental executive retirement plan obligations	$ 19,461	$ 20,851
Derivative liability	16,075	9,821
Unrecognized tax benefits	7,910	5,296
Long-term insurance accruals	7,539	7,424
Deferred payroll taxes	7,118
Other	1,974	2,412
Total	$ 60,077	$ 45,804