Accrued Expenses (Schedule of Accrued Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Expenses [Abstract]
Salaries and benefits	$ 20,958	$ 19,838
Real estate and property taxes	9,583	9,598
Unpaid capital expenditures	6,073	14,669
Other	26,417	23,513
Total accrued expenses	$ 63,031	$ 67,618