Accounts Payable and Accrued Liabilities (Schedule of Accounts Payable and Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 20,584	$ 16,115
Accrued property taxes	3,183	2,835
Accrued payroll	2,373	2,151
Workers' compensation reserve	3,898	3,446
Group health insurance	2,400	2,500
Other	5,809	4,753
Total accounts payable and accrued liabilities	$ 38,247	$ 31,800