Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued payroll and benefits	$ 18,110	$ 13,634
Accounts payable	9,361	8,382
Accrued interest	6,385	6,237
Avery Landing accrual	6,000	1,022
Accrued taxes	5,103	4,956
Other current liabilities	10,242	9,479
Total accounts payable and accrued liabilities	$ 55,201	$ 43,710