Accrued Expenses and Other Current Liabilities and Other Liabilities - Other liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Accrued Expenses and Other Current Liabilities and Other Liabilities
Supplemental executive retirement plan obligations	$ 20,851		$ 20,195
Derivative liability	9,821		3,134
Long-term insurance accruals	7,424		8,713
Unrecognized tax benefits	5,296		5,458
Deferred tenant improvement allowances			8,570
Deferred rent			4,455
Other	2,412		1,045
Total	$ 45,804	$ 38,620	$ 51,570