Accrued Expenses and Other Current Liabilities and Other Liabilities - Other liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accrued Expenses and Other Current Liabilities and Other Liabilities
Supplemental executive retirement plan obligations	$ 19,213	$ 20,851
Derivative liability	17,877	9,821
Long-term insurance accruals	7,562	7,424
Unrecognized tax benefits	5,350	5,296
Other	2,410	2,412
Total	$ 52,412	$ 45,804